Comments by BillWoodruff (Top 200 by date)

What level are you at with Linq and IEnumerable ? imho, that's important in responding to you.

Would another example, using simpler Linq, be helpful ?

I asked the OP what level he's at with Linq and IEnumerable.

+5 that code is like seeing notes by Bach for music he heard in his head (when he was deaf) ... and, when realized/played, was beautiful :)

the IGrouping of Anonymous Types it produces is a very strange beast; most mortals will have to struggle to enumerate/dereference it into "usable" form.

i wonder if the OP would benefit from a simpler version ?

how much memory do you have to work with, and, how did you end up with such a gigantic (not ordered) array ? what is the real world scenario, if any ?

"the number and values of the strings are unknown:" in an array of strings, each item is a string, and is the "value." confused.

imho, learning tricks/hacks like this is a distraction from learning C# and WinForms: it is a clever one-off ... it doesn't generalize in a useful way to other challenges.

try one of Jessie Liberty's, or Chris Sells', books on WinForms ... oldies, but rock solid resources, for building a foundation.

excuse me for saying this is a trick/hack, it increases UI/code obscurity, and, i would never expose a student to a technique like this. curmudgeon bill :)

Well does it work or not ? Do you understand now why your original code does not work.

There is nothing about the technique that depends on FrameWork version.

Please express your judgement of solutions by accepting or voting, or both.

Assuming this is a WinForms app created by using Visual Studio's 'New Project' menu:

Look at the program.cs file, and show the code that starts the APP.
If 'frmStart is the Main Form, the code I showed will work.

Amen !

Yes, thanks for your time ! imho, the compiler should break on duplicate names in an inheriting class ... by default. I am surprised ReSharper didn't flag this. Is it possible a new update of VS has affected ReSharper settings: I'll ask JetBrains.

I am tempted to post an example based on the fact that inheriting classes can access 'const fields in the class they inherit from, but, I think in this case, that's not what the OP needs, and, would be a distaction: what do you think ?

read all the comments, and look again: do you see any down-votes :)

fyi: #3 is not a downvote, to me.

This is very unclear. What is the DataTable in relation to the XML whatever ?

applause ! i have to vote this #5 now :)

imho, the type of OP we get here is unlikely to understand the advanced pattern-matching switch example, which, of course, does not make it any less valuable,

users will accept anything :)

and, it is your code ?

did you actually run this code and verify it works ?

have you actually run this code yourself and verified it works ?

then try something, and come back with code and specific questions.

voted #3 for response to gimme-codez OP who "haven't tried anything" on a question almost certain to be removed.

however, your reply is potentially helpful.

special medal for helping homework shirkers/procrastinators who "haven't tried anything" ?

i wanted the goodies in WPF, but bounced off XAML. when Sinofsky killed SilverLight, and took MS into the "Metro" weirdness ... and, then WPF cycled through deprecated and ? ... i lost interest.

the work Pete 0'Hanlon and others at CP in the "Disciples" group was fascinating, and, technically daunting.

having gone through the complexity of doing this in WinForms and finding it took lots of effort to make it "look right" whatever the user did ... i wonder if, for a beginner (?), maybe a suggestion to go with WPF is appropriate.

agreed: MDI is the evil demon that spawned this semantic plague ! :)

in the past, I was always surprised at the difficlty my students had getting "down" the difference between a class definition and an instance of the class. some had previous experience with VB or Java which seemed to contribute to their difficulty, and, if yoy do use inheritance from a "base form" in WinForms, you've got to do tricks to access the base form's controls that seem strange .. as strange as mucking with the base form desinger file to make stuff 'public.

did WPF fix all this ?

cheers, bill

p.s. for me "access to the instance" is a mantra.

I have discussed my syntax issues with using 'Parent ... again, here :)

imho, a serious design error by MS, and, it generates confusion in students ... compared to words like "access" that do not have the "baggage" of ZOrder, TopMost, etc.

Also, exposing the public internals of a creating class to classes it creates is, imho, a serious violation of SOLID.

start studying and experimenting ...state why you don't save a file using one of the standard, built-in, facilities, and a standard file-format.

thanks, Dave, my brain is not doing DateTime that well, now. i thought Sergey might have come roaring back.

p.s. wondering why a spammer would choose an old QA question,

+5

that's an excellent answer, if the OP wants a Console (string) type output !

i'd vote that #5 if you posted that as solution

You either:

1) drag-drop a DataGridView Control onto a Windows Form at design time

or

2) create a new onw in code, and then add that to the Controls collection of a container control, like a Form or UserControl.

DataGridView dataGridView1 = new DataGridView();

"If you have a letter A with fontsize being 14 and a letter B right follows A but has a fontsize of 30. The Height here for both these letters should be the same"

This makes no sense.

Assume a line of text in an RTF control where different characters are in varying fonts, styles, and sizes: what is your goal ? What happens at run-time ?


p.s. I spent years dealing with issues of character size and position, putting text on complex paths, etc., at companies like Adobe.

+5

"How to achieve dropdown and checkbox value saved and retrieved in .NET" your explanation doesn't clarify what you are trying to do.

"saved/retrieved" from what / to what ? where are the checkbox and dropdown located ?

Get your instructor to work with you to figure out what this assignment requires.

The complexity of efficiently altering an image's brightness or contrast can be seen in this complex example:

https://stackoverflow.com/a/3115178/133321

i'd say the OP probably wants to write doubles into the Excel WorkSheet Cells ... unless GemBox has some weird constraint.

+5

that sounds like another question, and how would anyone help you when you don't describe exactly what the map is, or its behavior ?

you are not doing the work/study/experimentation needed to make a plan for your game, and specify its components and how they function.

we are not here to write your code for you, but to help you solve problems with your implementation.

Make a detailed plan, and get to work.

... and ... ?

possible the OP is using Buttons, not images ?

why not learn to use WPF drag and drop ?

https://learn.microsoft.com/en-us/dotnet/desktop/wpf/advanced/walkthrough-enabling-drag-and-drop-on-a-user-control

what grid control are you using ?

https://learn.microsoft.com/en-us/dotnet/desktop/wpf/advanced/drag-and-drop-overview?view=netframeworkdesktop-4.8

Describe your IDE and app context. Why use the Registry ? Why not use an app Setting ?

show an example of a line of the data file, and show the output that is not formatted as you expect it to.

and what result from what you tried ? error message ? text does not appear in textbox as expected ? or ? where is the code that disables the textbox ?

+5

I have another opinion, Sir :) but, i have changed my vote on Rick's solution to #4.

"inappropriate" was an inappropriate term for conveying the idea that learning a Console app, which is interactive, is an investment of time and energy which will not generalize in the way that a simple WinForm app will.

i have a string of "Whatis4compareToABig44Number" i want it to extract repeated
characters like in the string it has repeated character "40maeri".

what is the expected output for this string ?

everyone here learns through mistakes, and incorrect assumptions. :) cheers, bill

Have you searched MS for Outlook interop support ?

look for support or information from "Apitron.PDF.Controls."

how do you know a byte array contains intelligible text ?

Describe your usage of 'Panel' in terms of structure: href="https://learn.microsoft.com/en-us/dotnet/desktop/wpf/controls/panels-overview

please review: https://wpf-tutorial.com/usercontrols-and-customcontrols/creating-using-a-usercontrol/

Research it, experiment: Post specific issues on a new thread on this forum.

Whar are you doing to persist (serialize, store) the list ?

thanks, i'll report that as a site bug to CP.

Well, great :) Perhaps it's tine you upvoted my solution ?

For some reason, I am getting 2 email notifications for each of your comments.

Hi, I wanr to help you if I can !

Right now, I need more specific information on what your problem is.

I suggest you post a new question which includes your current code and an example of output that is not what you expect.

Please do not send the same comment twice.

cheers, Bill

What have you tried ? And what solution are you after ?

Please be very specific.

+5 amen !

a node can have only one child node ? that's a linked list ?

what is the reason you need to traverse up and down at the same time ?

That indicates some kind of install error: you've got to identify the exact dependency that is not implemwnted, and remove the older whatever that is invoked now. Sorry I can't be more helpful.

but, your code does not cause an error ? Try putting a break-point at the start of your code, then single-step (F11), observing the state of variables.

What happens ... or does not happen ... when you run your code ?

While a TabPage doesn't expose an 'Enabled property at design-time, you can set it at runtime in code, and, the TabPage can still be selected.

see revised solution.

if this is C#, why are you using low-level API calls rather than controls on a Form or WPF Window ?

This idea and its code is so confused i suggest you get a good back on C# and study the "basics," and, re-think your design. What type of calculator increments some variable by #7 each time a mouse-click on a button occurs ?

There are lots of examples of C# calculators on-line: study them !

'base ? what is the context here that makes you use ;base ?

I suggest you set your MDIForm size in its code, then use use the Dock Property to make amy one of child Forms fill it.

Name:John,Age:18,Hobby:(text message)
Name:May,Age:17,Hobby:(text message)
Name:Jane,Age:17,Hobby:(text message)

this is the string output you want ? where each "text message" can havew any number of lines ?

from the "builders" of C# Tuples (.NET 4.0 release):

https://docs.microsoft.com/en-us/archive/msdn-magazine/2009/brownfield/building-tuple#id0400060

"The first major decision was whether to treat tuples either as a reference or value type. Since they are immutable any time you want to change the values of a tuple, you have to create a new one. If they are reference types, this means there can be lots of garbage generated if you are changing elements in a tuple in a tight loop. F# tuples were reference types, but there was a feeling from the team that they could realize a performance improvement if two, and perhaps three, element tuples were value types instead. Some teams that had created internal tuples had used value instead of reference types, because their scenarios were very sensitive to creating lots of managed objects. They found that using a value type gave them better performance. In our first draft of the tuple specification, we kept the two-, three-, and four-element tuples as value types, with the rest being reference types. However, during a design meeting that included representatives from other languages it was decided that this "split" design would be confusing, due to the slightly different semantics between the two types. Consistency in behavior and design was determined to be of higher priority than potential performance increases. Based on this input, we changed the design so that all tuples are reference types, although we asked the F# team to do some performance investigation to see if it experienced a speedup when using a value type for some sizes of tuples. It had a good way to test this, since its compiler, written in F#, was a good example of a large program that used tuples in a variety of scenarios. In the end, the F# team found that it did not get a performance improvement when some tuples were value types instead of reference types. This made us feel better about our decision to use reference types for tuple."

just to keep things interesting :)

// Flight is a Class
IEnumerable<flight> testflight = null;

// => true
bool isnull1 = testflight is null;

// ValueType assignment compile error
// (Flight, Flight) testflights = null;

// no compile error
// (Flight, Flight) testflights = default;

// no compile error
// (Flight, Flight) testflights = (null, null);

// no error
(Flight, Flight) testflights = (new Flight("X"), null);

// => false
bool isnull2 = testflights.Item1 is null && testflights.Item2 is null;

testflights.Item2 = new Flight("Y");

// => true
bool isnull3 = testflights.Item1 != null && testflights.Item2!= null;

consider: if testflights is immutable, what will/won't happen when its Item2 is assigned after its first use ?

:) Tony Hoare in 2009, speaking of his 1965 inventor of null: "I call it my billion-dollar mistake…At that time, I was designing the first comprehensive type system for references in an object-oriented language. My goal was to ensure that all use of references should be absolutely safe, with checking performed automatically by the compiler. But I couldn’t resist the temptation to put in a null reference, simply because it was so easy to implement. This has led to innumerable errors, vulnerabilities, and system crashes, which have probably caused a billion dollars of pain and damage in the last forty years."

Thanks ! I expanded the comment you just responded to. The second type declaration in your first example does not have a ? suffix ... accident ?

Since an IEnumerable is by definition nullable, why is the ? required ?

You use DisplayMember and ValueMember ONLY when you use binding. If you ARE using binding: reset them after you add items and reset the DataSource and see if that makes a difference.

As over-engineered as the Pragma weirdness :) ?

One other thought: is there something special about the Tuple Type that is a factor here ? In .NET 4.0, the new Tuple Type is a reference type; then, in 7.0, the "literal" Tuple (ValueType) was introduced.

So, if I'm using a Tuple that I believe is not literal: why, if I just return null, does the compiler shout:

Error CS0037 Cannot convert null to '(IEnumerable<flight>, IEnumerable<flight>)' because it is a non-nullable value type

Clearly it sees the Tuple I define as a ValueType which explains why returning 'default works, but, makes the fact (null,null) works ... strange.

+5 as usual :)

i am wondering if there's a better syntax for returning a null value for a Tuple like this where type T in an IEnumerable<t> is a reference type.

(null, null) does work.

see second example added to solution.

excellent answers are timeless :) ... and deserve up-votes !

+5

+5 very useful !

Have you considered opening an issue on the GitHub site ?

Got it. Wonder how many DFA gurus are using the internet from their Himalayan caves OMG :)

Happy New Year !

Writing a function that takes string data and a list of regex's as inputs, and then executes the regex's in sequence is not acceptable ?

1) ListBox Items are Type Object: when you assign them at design-time they will be Strings.

2) assigning other Types will work if their Type implements 'ToString.

3) your code:

a) every time you create a new "something" inside a method (locally), the reference to that something is lost when the method exits (goes out of scope). That is almost always a bad thing. Define variables of Type something outside the method, andassign new whatevers tp them inside the method: that way you don't lose the reference.

b) I can't tell what you are trying to do with this code: revise your original post, and clearly explain it.

fyi: there is a Dapper area on StackOverFlow: https://stackoverflow.com/search?q=dapper

then, you'll have to do the hard work of finding that icon file in Windows using the techniques I directed you to. but, first, you need to research if Windows includes a 128x128 or larger icon for "This PC" which is a rather unique icon in terms of usage.

https://www.creativefreedom.co.uk/icon-designers-blog/windows-7-icon-sizes/

when/if you have the Icon file, you can display it in a Picturebox:

picturebox1.Image = TheIcon.ToBitmap();

What shows up on screen for a UFO ... a bitmap ? an icon ? a character in a font of picture/symbols ? ?

Unclear: are you asking how to report the state/value of something you did not find, or did not expect to fins ?

Sorry, that's the only thing i can think of ... one way to check that might be to look for some other call to that librarys facilities and see if that, also, breaks ?

Are you sure Win 10/11 does nor have a 128x128 size This PC icon ? You can almost certainly find a graphic you can capture or download on Google:

https://www.google.com/search?q=windows%2010%20%20%22This%20PC%22%20icon&tbm=isch&hl=en&tbs=isz:l&rlz=1C1CHWL_enTH966TH966&sa=X&ved=0CAIQpwVqFwoTCIiispW2mPUCFQAAAAAdAAAAABAC&biw=1352&bih=641#imgrc=6zy-nC76FaRv_M

well, i should not have mentioned "actual code" ... no time to try and decipher other people's complex code ... i'd be surprised if any of us who volunteer here would do that.

Is there any way you can examine the project file, or other app settings, to see if there is a valid reference to 'System.Runtime, Version=6.0.0.0 ?

I wish I could assist further, but, without using your actual source code, I can only think of one more thing to check:

Set break-points after the DataGridView loads, and after you have reset the binding source:

When you hit the break-points: examine the 'Enabled and 'EditMode properties of the DataGridView: see any difference ?

Your solution is logically inconsistent: you say OG's is correct, and it is ... then, you show an example of inserting a Form into another Form's Controls which is not only a bad practice, but also is not relevant to the OP's question.

Voted #1: Putting a Form inside another Form is always a bad idea. In this case the user asks how to load a Form.

If we do your homework/coding for you, you will learn nothing.

"Difficult to help OP as he clain no problem and just want a full blowup solution with explanation."

So, a statement with no content deserves a solution with no content ?

You are a tourist, lost in a big city: you ask a local for directions to the bank; they reply: " 'bank' is found in the 'B' section of the dictionary." :)

voted #1: this reply has no content that might help the OP.

+5 a thorough, satisfying, reply !

If this is an assignment, you need to clarify what the assignment actually is.

An assignment to create a structure that emulates a C# Array, but provides Add/Remove functions makes no sense: if you remove an element the indexes may no longer point to the elements they were originally accessed by.

Yes, a possible hypothesis, but, i think we don't have enough information to make that a probable hypothesis. imho, the most probable hypothesis is that the OP is confused.

I've added another comment to the OP's post.
to try and get them to clarify,

Merry Xmas :)

+5 at last the voice of reason speaks :)

Start experimenting and post code here with specific questions.

The date data you show here are not Hjri dates ? Is the problem how to convert to Hijri date ?

+5 what a thorough analysis !

Look carefully at the difference in structure between the first two entries, and the third: variations like that make parsing much more complex,

Is there any way you re-structure the data to avoid inconsistency in format ?

Consider using a GIF file.

Hi, that partly clarifies the context for me, thanks, but, i define my role here as "educator," and, the idea of helping you write code for some project of which you are a team-member, and. you can't disclose details ... that is not the dance music my feet are keen to move to :)

A general solution to creating a grid of sub-grids, and then efficiently
accessing/selecting "cells" by any arbitrarily defined row, #rows, column, #columns, sub-grid, etc., is an interesting problem ... particularly, if you have nested sub-grids beyond 1 level deep.

In your case, i don't think you'll need to get recursive (deal with more than one level of sub-grids).

Depending on my energy level, I may post some general ideas about one strategy you might pursue.

cheers, bill

Hi, This question is specific enough i can help you with some specific code :)

First, i need to see/understand the code/strategy that creates the grid:

Are you binding the grid to a DataTable; or, creating it directly in a nested for loop ?

And, i believe you omit the case that you need to check for duplicates in a 3x3 sub-grid.

Are you looking for a generic solution for any size grid, or, only a solution for the classic Sudoku 3x3 sub-grids each 3x3 ?

As Richard said, this is pretty simple, but, imho, a program that shows a moving picture until it exits is almost always annoying.

If you want the user to be able to do "other things" while the picture is being displayed, doing that in the SAME Form means you'll have to run it in a separate thread.

you just go ahead and quibble all you need to :)

to compare different methods of string to number conversion: http://aspalliance.com/80_Benchmarking_IsNumeric_Options.all

appears to be a repost of: https://www.codeproject.com/Questions/5319708/Create-a-scrolling-text-in-the-title-bar-of-visual

look ma, no errors:

000533 => 533
6.626E-34 => 6.626E-34

see comments in my solution below :)

okay, but, conversion will result in values of the same type ?

Are the numbers represented by the line-strings always of the same Type ? i.e. : Int32, or Double /

Hi, I don't want to see your script code ... I do want to see if I can help you to "pin down/define" what you want in a way that you can get more specific feedback :)

Please revise your original post to include;

The context in which you plan to use Unity ... in WPF, or, WinForms ? other ? What language is your script written in and what is its execution context ... in Unity ?

Describe the structure of your grid; show your code method that defined the Grid,

Sleep well, GMT+7 here :)

Are you using WinForms, or WPF ?

I do know you can use Unity 3d in WinForms, although I have never tried that:

https://docs.unity3d.com/Manual/UnityasaLibrary-Windows.html

I'm having difficulty visualizing what the different size grids are. Let's take the typical 3x3 sub-grid case where each sub-grid is 3x3 cells ... 9 rows, 9 columns, 81 cells.

I assume your script will "seed" the grid with valid initial values ... right ?

Then, the user will input a value in a cell, and you wish to check if that value is valid for the row and column where the value is entered ... right ?

One obvious strategy is to define the data structure for the grid, then pass it by reference to the code that seeds it with initial values ... does that seem relevant ?

"3d ness" ? Are only the contents of the cells 3d elements ? I am not familiar with Unity 3d, so don't know what data structures are available.

Glad you found my response relevant.

"making the 2D Array to hold the selected values for all subgrids."

please clarify what "selected" means here: this refers to cells the user has selected, or cells containing user entered values ... or ?

"I have been able to get a script that generates the whole grid"

what structure is returned by the script ? an array ?

What makes your game 3d ? What does the player see that a 2d flat grid doesn't show ?

+5

see: https://stackoverflow.com/a/32258205/133321

If you study this book, your question will be answered.

https://www.amazon.com/Egyptian-Hieroglyphs-Complete-Beginners-Manley/dp/0500290288

If we do your homework, you will learn nothing.

Interesting: I am evaluating why the T here is not declared IEnumerable, and why People is not passed, as a param, to DistributeChocolates ... makes me "nervous" ... I'll get over it :)

I was hoping to give you enough of a "clue" that you could complete the code by yourself. By removing the thread, you prevent anyone else seeing my response.

"Double posting" like this is technically against forum guidelines.

I find it unfortunate that other responders here write your code for you, rather than educate you. If we do your homework, you will learn nothing.

Think about it.

Did you remove your previous question, and my responses ?

'TRyParse returns a boolean 'true if the conversion was successful:

https://docs.microsoft.com/en-us/dotnet/api/system.int32.tryparse?view=net-6.0

+5

Start by searching CodeProject.

What happens now when you run your code ? Errors ? Unexpected bresults ?

The revised code in my answer triggers the Dialog only when dataGridView3 has #0 rows.

All Selected rows are deleted with each button press.

Sorry, I'm too busy trying to post useful solutions to on-topic posts to continue wasting time on you.

p.s. a "suggestion" should avoid use of the word "should."

As expected, use of an ad hominem non-question to deflect response to the substance of my comment. Yawn.

Do you need rep points so badly you will post a non-solution to a non-question that will almost certainly get removed from QA ?

this is a comment, not a solution.

The revised code triggers the Dialog only when dataGridView3 has #0 rows. I that not what you asked for ?

See revised code above.

You need to research genetic algorithms, select a programming language, and start experimenting. When you have code to show, and specific questions, come back here.

See those link to the right under "related question:" start there.

Indeed, 'Return of the Sophist' re-run.

please translate to English, and tag your question with appropriate Tags, like Excel.

You need to state clearly what you are trying to do.

Tag your question with appropriate tags: C# version, FrameWork version. Visual Studio/Code info.

Clarify exactly what is done in Win Forms, and what the use of AvastUI is about.

Are the Button and Panel standard WinForm controls on a Form ?

Are you asking how to make a Button or a Panel with rounded corners in WinForms ?

Maybe ?

).Cast<cl_elab>().ToList();

"if I want to load the txt file back into the datagrid I get an error from the compiler again"

I wish I were psychic :) What error: where did it occur ?

Set break-points and single-step through your code (F11) until you find exaxtly where an error occurs.

i treasure these moments when i can see we are, temporarily, in different universes :)

"No he is asking how to ensure only one execution of a specific application is running at any one time."

uhhh ... that is what I said.

"You can run any number of copies of an application, even if it contains a singleton class within it."

The OP is talking about an application, not a class: i assume the OP is/has written the App, and the task is to enforce singleton behavior on one machine. Use of Mutex is one standard way to create a Singleton in a context where thread safety is critical.

It's been over 15 years since i touched C++, and i am not aware of current issues in creating Win apps.

hi, we are talking about making an app behave like a singleton class here.

"What is a Singleton class in C++?
Singleton in C++

"Singleton is a creational design pattern, which ensures that only one object of its kind exists and provides a single point of access to it for any other code. ... You can't just use a class that depends on Singleton in some other context. You'll have to carry the Singleton class as well."

https://refactoring.guru/design-patterns/singleton/cpp/example

If we/others do your homework, you will learn nothing.

How do you code a program that simulates MARIE? - Reddithttps://www.reddit.com › AskProgramming › comments
2 days ago — Find the specs for how a MARIE CPU is supposed to work, implement a ... Going deeper, maybe you want to simulate each clock cycle, ...

How do I code a program in C# within Visual Studio that ...https://stackoverflow.com › questions › how-do-i-code-...
4 hours ago — I have a coding assignment due in 3 days that requires me to create a program in C#, within Visual Studio, that simulates MARIE.

what does "extract" mean ? break each record into a series of strings ? or, create instances of a strongly typed structure ?

A key factor in determining the complexity of the code you'll need to write is how reliable the data is; for each field, like "ip address," will you need to write validation code (or use a RegEx) to check it ?

+5

Why aren't you asking Telerik support ?

once again:

"I dock the FlowLayoutPanel on TableLayouPanel to enable the autosize of the User Control."

Why are you using both a FlowLayoutPanel and a TableLayouPanel ?

"I dock the FlowLayoutPanel on TableLayouPanel to enable the autosize of the User Control."

Why are you using both a FlowLayoutPanel and a TableLayouPanel ?

define what "custom commands" are

no apology necessary, but, my time here is limited; any code you post here i will look at. i think you'll find folks here, or, on StackOverFlow, will not go to any external site to view content (security issues).

whatever your code is, i believe it must provide the three facilities i describe in my answer.

cheers, Bill

Hi, i am here to teach you how to help yourself develop your own code, not to write code for you.

Your question is relatively simple: start by completing the steps i outlined for you in my answer. Post your code here, and ask specific questions about the code.

cheers, Bill

+5

+5

2nd. repost

Please define exactly what "alignment" means. What do you expect to SEE after "alignment" ? What are "Transformation" and "PCALib" ?

We can't read your mind.

put breakpoints in your code; single-step through it using F11, examine the values of variables ,,, that will show you what the problem is.

If we do your homework, you will learn NOTHING !

Is brushing your teeth after a meal a good idea if your house is on fire ?

One non-sequitur deserves another :)

+5

saying to a homework shirker whose plea for someone else to do their work, and, whose no-content post is almost certain to be removed: "go elsewhere and educate yourself," has no benefit except to inflate your reputation.

if a post like this is not removed, then the forum is cluttered, and, other users will also ignore the forum guidelines clearly described in the FAQ.

i'm unable to replicate the behavior in the update you describe.

before

name Column1 displayindex : 0
name Column2 displayindex : 1
name Column3 displayindex : 2
name Column4 displayindex : 3
name Column5 displayindex : 4

dataGridView1.Columns[4].DisplayIndex = 2;

after

name Column1 displayindex : 0
name Column2 displayindex : 1
name Column3 displayindex : 3
name Column4 displayindex : 4
name Column5 displayindex : 2

i do know that weird results can occur if you move column #0 to another location, or move a > #0 column to #0.

put breakpoints before and after you set the DisplayIndex, and examine the runtime Columns state.

This is too abstract for me to respond. Please add more detail. What is the purpose of this application, who are its users ?

Okay, i can see that, now :) Have you explored the possibility of defining your own custom DataGridViewColumnHeaderCell ? While i would override CellPaint ... because i often have several reasons for doing that ... i would check out: (i have not tried it)

https://stackoverflow.com/a/24824261/133321

you're welcome :) i find myself wondering why you would want to hide a specific ColumnHeader Text. i can imagine changing the column header text for various reasons. cheers, bill

Well, good luck wit that.

Define a "real" OS. Unless you are an experienced developer with years of experience, and intimate knowledge of Win and .NET internals, I believe you will waste your time, and achieve nothing.

Why aren't you reading and studying the Cosmos docs:

COSMOS Repository on GitHub - The COSMOS source, issue tracker and other downloads
COSMOS Discussions on GitHub - Ask general questions, get help and show off your projects
COSMOS Discord Server - Ask any COSMOS related questions or just chat with other Cosmos users
COSMOS Facebook Page - Our blog where we post updates and other news.
COSMOS YouTube Channel
The current Cosmos DevKit and UserKit API Reference.

Why not ask the author of the article ? Be sure and include the version of C# and FrameWork you are using.

https://www.codeproject.com/Articles/75770/Basic-serial-port-listening-application

imho, this OP needs education, not having his code written for him.

Any knowledge you have about patterns in the data can be exploited. "Real world data," is often not random.

If the data is "meaningfully" random, then you may be able to omit sorting. Of course, if sorting is a requirement ...

okay, i'll study your explanation when i am more rested. another possibility is: a point may be on more than one segment. to the extent you can narrowly define the results you want, and exclude testing for other cases, you can optimize the code.

in "real world code," skilled programmers often optimize using assumptions about the likely frequency of what types of values the data holds. for example, if i can assume every point is on the line, i can omit testing for that; if the data os organized by magnitude, maybe i don't need to sort.

Different search functions may be used to optimize searching.

Hi, maybe my brain is not at 100% today :) If i think of a horizontal line from x0,y to x1,y then any point on the line can be defined by an x value, and any segment by two x values. In the case the segments do not fully cover the width of the line, there is a possibility that a point can be on the line, and not on any segment.

Other possibilities include: a point is outside the line; or, a segment is "not legal" ... however you define "not legal."

If this accurately describes your "context," please help me understand how the sample data shown "work."

Don't play with guns !

An interesting question which i upvoted ... i only upvote class/homework posts that, like yours, show code and substantial work on implementation.

? Check the data for the Samples: they don't seem to be accurate given the description.

once again you are posting a kind of semantic fantasia, where you pose as some kind of sophist disputing documentation.

if you want to learn C#, experiment, and observe behavior, and generate hypotheses, as well as study documentation.

imagine a carpenter that can tell you how a saw works, but, has never tried to use one.

You're kinder than i am :) Indeed, strings are weird critters, and i hear echoes of Eric's classic mantra "implementation detail" every time i wander into the wilderness of what a char[] is doing in a box like 'string.

Rude ? This is not about You.

+5

Please define what "INLINE" means; why would you sort a ListBox's contents rather than sort a column in your DataTable, or other structured data source ?

i think this post might be from the latest incarnation of someone we know, whose specialty is semantic confusion. New member, #1 post.

What String is vis-à-vis reference/value-type, and how Strings are managed vis-à-vis heap/stack has some complexity that Eric Lippert has written about. Reference on request.

great, please tag your question to indicate context. context is important to know since search facilities/methods vary.

please tag your question to indicate if this is ASP, or WinForms, or whatever.

what would would the type of search queries you want to perform look like ? what syntax; what results expected ?

are you saving the blogs to a file, to a DB ?

my inability to read your language is at work here :)

Hi George, I will not engage with this thread further because i see no positive outcome in terms of enduring CP quality, and, my time is limited by vision problems.

Trying to drag information out of you piece-by-piece to try and get the big picture of what you are doing is a waste of time. Amd, i qn not about to go baxk to Win 7 and an early .NET Framework to test your code.

i have carefully verified your code, and Luc's, will not work in a standard VS 2019, C@ 4.8 Console app for reasons i understand completely.

i believe the idea/strategy of using both a Form and a Console is a serious mistake that will result in unnecessary complications.

What i will do, that i think will be valuable for CP in the long run, and will not waste my time, is to post a tip/trick showing what i consider a useful architecture for interactive run-time control of a WinForm's behavior where "control" is defined as response to a well-defined set of commamds, and/or queries.