How to access data from a control on one from from another form? [modified] - C# Discussion Boards

praths_c11-Dec-06 4:20

11-Dec-06 4:20

Ok, but lbFonts is a listbox which i dragged and dropped on the form in visual studio. Do i need to initialize it? I assumed it is done automatically when u drag and drop the component on the form.

Re: Newbie: NullReferenceException

Stefan Troschuetz11-Dec-06 4:28

Stefan Troschuetz

11-Dec-06 4:28

It should be done automatically, but maybe something gone wrong or you're calling the method at some moment of the form's lifetime were it's already uninitialized. As the other poster said use the debugger to find the cause of your exception.

"Programming today is a race between software engineers striving to build bigger and better idiot-proof programs, and the Universe trying to produce bigger and better idiots. So far, the Universe is winning." - Rick Cook

www.troschuetz.de

Re: Newbie: NullReferenceException

gnadeem11-Dec-06 10:46

gnadeem

11-Dec-06 10:46

hi.
on my system this code runs fine. both as a class and as a method. however i didn't extend class from Form, rather just created a form and added a control. check your initialization code for FontSelection class (in addition to the base class Form).

regards.

Running an application by the start up of the windows

hadad11-Dec-06 2:34

hadad

11-Dec-06 2:34

How can I run my desktop application automaticly by the start up of the windows

Dad

Re: Running an application by the start up of the windows

Stefan Troschuetz11-Dec-06 2:38

Stefan Troschuetz

11-Dec-06 2:38

Create a shortcut to the exe inside the "Startmenu"-"Programs"-"Autostart" folder.

Re: Running an application by the start up of the windows

Eric Dahlvang11-Dec-06 2:50

Eric Dahlvang

11-Dec-06 2:50

Add a new string value to the registry key HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run that points to your app.

--EricDV Sig---------
Some problems are so complex that you have to be highly intelligent and well informed just to be undecided about them.
- Laurence J. Peters

Re: Running an application by the start up of the windows

Pete O'Hanlon11-Dec-06 4:50

Pete O'Hanlon

11-Dec-06 4:50

Or, more properly, create it as a Windows Service so that the end user can control the start up mode for the application, e.g. does it start up as Automatically or Manually.

the last thing I want to see is some pasty-faced geek with skin so pale that it's almost translucent trying to bump parts with a partner - John Simmons / outlaw programmer

Deja View - the feeling that you've seen this post before.

How to access data from a control on one from from another form? [modified]

Saira Tanwir11-Dec-06 1:45

Saira Tanwir

11-Dec-06 1:45

hello
i'm trying to use the values i get from this code

for(int i=0;i<count;i++)<br />
	{<br />
	indice[i] = TableListBox.CheckedIndices[i];<br />
	MessageBox.Show(indice[i].ToString());<br />
	}

where TableListBox is actually a CheckedListBox and its checked indices are being stored in another array.
Now the problem is that when i run this code from its respective form it works fine, but as soon as i close the form and try to access this chunk of code from another form, it gives me the Index out of bound exception for CheckedIndices. i expect this is due to the reason that as soon as i close the form with the CheckedListBox, all its values are discarded.

i've tried solving this problem by storing the CheckedIndices into a static array, but it still is giving me the same exception.

So plz can anyone guide me about this problem of mine and tell me how to retain the checked indices after the form has been closed.

Thanks and awaiting ur reply
Saira

-- modified at 8:34 Monday 11th December, 2006

Re: How to access data from a control on one from from another form?(URGENT)

Not Active11-Dec-06 2:17

Not Active

11-Dec-06 2:17

Posts marked URGENT will usually get ignored

only two letters away from being an asset

Re: How to access data from a control on one from from another form?(URGENT)

Saira Tanwir11-Dec-06 2:30

Saira Tanwir

11-Dec-06 2:30

well mark
very kind of u to tell me that ,i'll be more careful in future.;P
so can u help me?????

Re: How to access data from a control on one from from another form?(URGENT)

quiteSmart11-Dec-06 2:34

quiteSmart

11-Dec-06 2:34

you don't need to close it just hide it

Re: How to access data from a control on one from from another form?(URGENT)

Saira Tanwir11-Dec-06 2:49

Saira Tanwir

11-Dec-06 2:49

it still gives the same exception

any other suggestins???

Re: How to access data from a control on one from from another form?

Nader Elshehabi11-Dec-06 3:25

Nader Elshehabi

11-Dec-06 3:25

First the info you've provided isn't suffecient to judge the problem, but I'll take few guesses here.
1- The way you use to copy the array -ignoring the MessageBox of course- is quite wrong. You should use Array.Copy() or Array.CopyTo() static methods instead.
2- Failure of the static array ecludes that discarding the values of the CheckedIndices when closing the form is the problem.
3- Make a breakpoint and see the values of:
a. count
b. CheckedIndices.Count
c. indice.Count

Waiting for your reply.

Regards

Re: How to access data from a control on one from from another form?

Saira Tanwir11-Dec-06 3:58

Saira Tanwir

11-Dec-06 3:58

well nader

the way i'm copying indices like this is due to the requirement of my problem.
the code i mentioned above is actually a function of form A. when i access this function from Form A, it works fine. But as soon i call the function from Form B it gives the exception. the complete function is:

public int[] GetCheckedIndices()<br />
	{<br />
	int count=Global.Instance.Count_Indices;<br />
	indice = new int[count]; <br />
	MessageBox.Show(count.ToString());<br />
	for(int i=0;i<count;i++)<br />
	{<br />
	indice[i] = TableListBox.CheckedIndices[i];<br />
	MessageBox.Show(indice[i].ToString());<br />
	}<br />
	return indice;<br />
	}//end function

now TableListBoxis the name of me checkedListBox
and CheckedIndices is its property.
indice has been declared as "public static int[] indice".

CheckedIndices.Count has the index of the items that have been checked in the chckedListBox.
ope this gives u enough information to understand the problem

awaiting you reply.

Re: How to access data from a control on one from from another form?

Nader Elshehabi11-Dec-06 5:21

Nader Elshehabi

11-Dec-06 5:21

Things are starting to clear up a bit, but don't be frustrated when I tell you that you still didn't answer all of my questions. I'll put them straight this time:
1- Do you call GetCheckedIndices() from FormB directly? please post the code in FormB.
2- What is Global.Instance.Count_Indices?
3- When the above method is called by FormA. What are the numerical values of:
count, indice, TableListBox.CheckedIndices
4- Again when you call the same method from FormB; What are the respective values?

Forgive me if I didn't get a clear idea, or if I'm asking too much misleading question, but I'm trying to cover all the possibilities here.
Waiting for your reply. I hope that my next reply would be the answer.

Regards

Formatting Day part of DateTime

kaleem tarar11-Dec-06 1:19

kaleem tarar

11-Dec-06 1:19

Hi,
i want to format DateTime so that Day part of Date should be printed like that '1st','2nd','3rd','4th' etc. Please help me in this regard.

Best Regards
Kaleem

Re: Formatting Day part of DateTime

Not Active11-Dec-06 2:23

Not Active

11-Dec-06 2:23

There is nothing built in to .NET that I'm aware of. The closest you'll get is say: 1 November 2006. You would have to create a custom class to handle this.

only two letters away from being an asset

image upload using atlas

chaitu911-Dec-06 1:06

chaitu9

11-Dec-06 1:06

hi iam using atlas in my webapplication i need to upload an image and its not working
regards
chaitanya

chaitanya

Re: image upload using atlas

Not Active11-Dec-06 2:16

Not Active

11-Dec-06 2:16

So what is the problem you are encountering?

only two letters away from being an asset

Re: image upload using atlas

Guffa11-Dec-06 3:30

Guffa

11-Dec-06 3:30

Standard question #1:
What do you mean by "not working"?

Standard question #2:
What error message do you get?

Standard question #3:
What does your code look like?

---
b { font-weight: normal; }

Invoking DirectX 9 [modified]

Thitechx11-Dec-06 0:51

Thitechx

11-Dec-06 0:51

i'm novice in C#.net 2005 and i want to know how to call or invoke the directX, how to display an image to the screen (full screen size) and how to play a music(.wav or .mp3).? what are the libraries needed..? Please give sample codes....

Sorry for my awkward english.... Big Grin | :-D

plz help!!! Cry | :((

-- modified at 7:41 Monday 11th December, 2006

Re: Invoking DirectX 9

Bekjong11-Dec-06 2:01

Bekjong

11-Dec-06 2:01

Try using the DirectX 9 SDK. Examples are included. But if you're a novice at C# then I suggest you learn the basics first, since directx isn't so simple to begin with...

Re: Invoking DirectX 9

Thitechx11-Dec-06 23:07

Thitechx

11-Dec-06 23:07

hi.....

what i mean of novice is im novice not on the language C# but only about invoking direct X using this language...... sorry for making you confused!!!

you have an idea about my problem..??

plz help!!! Smile | :)

Re: Invoking DirectX 9

Bekjong11-Dec-06 23:37

Bekjong

11-Dec-06 23:37

Well, if you have some expercience already, I assume you already know about gdi. I'd use that to display the image. If you need a way to go fullscreen, just google. There's plenty of examples. Also, there's a p/invoke thingie for playing sound. If you insist on using directX, I don't see why you would, just use the examples that come with the sdk.

iterating through a datagridview and getting the value of unbound combobox

Rocky#11-Dec-06 0:51

Rocky#

11-Dec-06 0:51

hi every one,

when u have an unbound combo box in the datagridview. how do u get the value selected in that combobox. I'm trying to do that and its giving me a nullref exception. I'm working in c# 2.0 windows forms

I was trying to access that with somethin like this

datagridview1["AttendanceComboBoxColumn",i].Value.ToString();

but its not working.
plz help its urgent

thanks in advance!!

Rocky

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