Re: RSA with private key - C# Discussion Boards

Judah Gabriel Himango20-Sep-05 9:19

20-Sep-05 9:19

If you really need it, add a reference to System.Windows.Forms, then you can use the reference to do a MessageBox call. But I question why you would need to do this; a console application shouldn't be using UI components for several reasons.

Tech, life, family, faith: Give me a visit.
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Judah Himango

Re: MessageBox in console application

Mr Marchepane20-Sep-05 10:15

Mr Marchepane

20-Sep-05 10:15

I want to use a MessageBox in separate class to report exceptions like "file not found" but I test this class in console application.

I started learing C# today, so its hard for me to understand what should I do without example.
Reference? Uhm... in C++ I only had to add #include <windows.h>

Re: MessageBox in console application

Judah Gabriel Himango20-Sep-05 10:27

Judah Gabriel Himango

20-Sep-05 10:27

Are you using Visual Studio? If so, right-click on your "References" folder in the Visual Studio Solution Explorer, and click "Add Reference". Find the System.Windows.Forms.dll and add a reference to that. Now you can use anything in the System.Windows.Forms namespace.

The reason .NET is broken up among several dll files is that loading a single large dll is too costly, and most developers wouldn't use even a quarter of the functionity available in the big dll. So Microsoft split up the framework into chunks: System.dll, System.Xml.dll, System.Windows.Forms.dll, etc. If you need functionality from those, you add a reference to that dll.

Tech, life, family, faith: Give me a visit.
I'm currently blogging about: Cops & Robbers
Judah Himango

Re: MessageBox in console application

Mr Marchepane20-Sep-05 10:46

Mr Marchepane

20-Sep-05 10:46

Thx a lot, that's exactly what I needed Smile | :)

Strange that it wasnt mentioned in any book/tutorial I read.

RSA with private key

IsaacB20-Sep-05 8:21

IsaacB

20-Sep-05 8:21

.NET includes a way to encrypt something with RSA private key
and decrypt with RSA public key?

or do I have to use an external component

anyone has references or code snippets?

thanks in advance

Re: RSA with private key

Not Active20-Sep-05 9:22

Not Active

20-Sep-05 9:22

System.Security.Cryptography[^] Pretty hard to look up D'Oh! | :doh:

Re: RSA with private key

IsaacB20-Sep-05 10:04

IsaacB

20-Sep-05 10:04

Well I did checked MSDN, but since I have never used this namespace I have the doubt, the RSA implementation in .NET asks the public key to encrypt and private to decrypt but I need the opposite

the private key to encrypt and the public one to decrypt, is this possible?

-- modified at 16:06 Tuesday 20th September, 2005

Re: RSA with private key

Dan Neely20-Sep-05 10:41

Dan Neely

20-Sep-05 10:41

RSA keys are 'symetric' (not the best choice of words but I can't think of anything better to use). You can pass the public key to the private parameter and vice versa, and it will work. This's the principle difference between encrypting and signing a document (the other being that signing only runs a hash through the RSA algorithm).

Crystal Reports for Visual Studio .NET (Parameter Fields Runtime Customization)?

Naveed Kamboh20-Sep-05 6:50

Naveed Kamboh

20-Sep-05 6:50

Hi all,
I had found the way to change parameter field of crystal report in .NET in this page http://msdn.microsoft.com/library/default.asp?url=/library/en-us/crystlmn/html/crtskparameterfieldsruntimecustomization.asp

Problem is i can not method ParameterFieldName() for variable parameterfield
I any one help i would be obliged

Following code is from the link sited above

ParameterFields paramFields = new ParameterFields ();
ParameterField paramField1 = new ParameterField ();
ParameterField paramField2 = new ParameterField ();
ParameterDiscreteValue discreteTulane = new ParameterDiscreteValue ();

ParameterDiscreteValue discreteDenlane = new ParameterDiscreteValue ();

discreteTulane.Value = this.tulane;

paramField1.set_ParameterFieldName("ntulane");
paramField1.set_CurrentValues(discreteTulane);

paramFields.Add(paramField1);

discreteDenlane.Value = this.denlane;
paramField2.set_ParameterFieldName("ndenlane");
paramField2.set_CurrentValues(discreteDenlane);
paramFields.Add(paramField2);

this.crystalReportViewer.ParameterFieldInfo = paramFields;

Thanks alot for support!

Naveed Kamboh

MSDE 2000 Insance Invalid

theStorminMormon20-Sep-05 6:43

theStorminMormon

20-Sep-05 6:43

OK, I'm trying to reinstall MSDE 2000. Used control panel->add/remove programs to get rid of the last one.

But no matter what isntance name I use in the setup ini file (or command line) I get the error "The specified instance name is invalid."

Any ideas?

The ends can never justify the means. It is the means that determine the ends.

.Net Remoting and WebClient memory trouble...

The Liquidian20-Sep-05 6:19

The Liquidian

20-Sep-05 6:19

Hi everyone…

I am using .Net Remoting (C#). I need to use a WebClient do get an image from a URL. I need to constantly retrieve the image, therefore I have the code in an infinite loop (within a thread). The thread sleeps for ½ a second.

The code runs fine if I run it without using Remoting, however when I use Remoting the program uses up all the memory on the server!

I have stripped the code of all complications. Basically all the thread does it:

System.Net.WebClient webClient = new System.Net.WebClient();

webClient.DownloadData(URL);

And then it sleeps. But as I say, this uses up all the memory resources?

I then moved the code into a console application that does the webClient.DownloadData(URL) call, then it calls a method on the remote object to pass it the data. But I ended up with the same problem, all the memory got used up? Sniff | :^)

Please try using the web client, within a continuous thread, and within Remoting.

As soon as I mix Remoting and the WebClient, the memory gets used up. The page file usage sky rockets! Frown | :(

Am I missing some obvious flaw with trying to use Remoting and a WebClient together? D'Oh! | :doh:

Can anyone offer me some advice????

Outlook, own EMailAddress

mkano20-Sep-05 6:09

mkano

20-Sep-05 6:09

Hy,
short and barely: How to read my own EMailAddress from Outlook.

I'm lose hope.

Thanks

Website Counter

jeff1920-Sep-05 4:40

jeff19

20-Sep-05 4:40

How do I use ASP.Net with C# to create a counter for a website?

jeff19

Re: Website Counter

Jon Sagara20-Sep-05 7:42

Jon Sagara

20-Sep-05 7:42

Did you even search this site?

http://www.codeproject.com/aspnet/ewcounter.asp[^]
http://www.codeproject.com/aspnet/fastcustomhitcounter.asp[^]
http://www.codeproject.com/aspnet/EasyHit.asp[^]

Or Google?

http://www.google.com/search?q=c%23+asp.net+hit+counter[^]

Jon Sagara
As you may presently yourself be fully made aware of, my grammar sucks.
Sagara.org | Blog | My Articles

J.O.N.S.A.G.A.R.A.: Journeying Operational Neohuman Skilled in Assassination, Galactic Analysis and Rational Astrophysics

Using C++ in C# appliacation

Yoyosch20-Sep-05 4:15

Yoyosch

20-Sep-05 4:15

I would like to make the whole application in C# and reserve some place in main form for animation, which I would like to perform using OpenGL in C++. Is it possible? If yes, how?

Re: Using C++ in C# appliacation

Not Active20-Sep-05 9:05

Not Active

20-Sep-05 9:05

Yes, you can use unmananged code within c#. Use PInvoke[^]

MSDE 2000 connection error

theStorminMormon20-Sep-05 4:06

theStorminMormon

20-Sep-05 4:06

I posted a couple of messages on this topic last month. I got a lot of great help and suggestions, but after taking the time to implement all of them I'm still not able to connect to my database over the network.

Using the CodeProject tutorial: "Hands on how to configure the Microsoft MSDE" I just did a fresh install of MSDE 2000 enabling networking and using windows authentication. The instance is DomBenBSA running on computer DB-NGIVENS. I accidentally killed my testing database, but I recreated it and attached it to the server: it's BenefitSelectDB.

So now I have the server running and I go to my laptop. I'm logged onto the domain (DB) with my standard login (NGIVENS). I'm using RapTier to try and connect to the database (it's just faster than running test C# connection strings).

I can detect the server (DB-NGIVENS) - which is more than I could do before - but when I try to get to the database I get this error (when i'm using Windows Auth):

[DBNETLIB][ConnectionOpen (Connect()).]SQL Server does not exist or access denied.

Here's the interesting thing. I go back over to the host machine where I have the server installed and check out my list of users. I don't see myself anywhere. So I add the user 'DB-NGIVENS'. When I try that, I get this error:

Msg 15063, level 16, State 1, Server DB-NGIVENS\DOMBENBSA, Procedure sp_grantdbaccess, Line 116
The login already has an account under a different user name.

So now I'm confused. If the login already has an account under a different name - how can I logon from another computer where I'm logged in as myself?

Any help would be SO appreciated.

(By the way, here are the users that I do find:

db_accessadmin
db_backupoperator
db_datareader
db_datawriter
db_ddladmin
db_denydatareader
db_denydatawrier
db_owner
db_sercurityadmin
dbo
guest
public)

The ends can never justify the means. It is the means that determine the ends.

Select ListView Item on KeyPress

miah alom20-Sep-05 3:59

miah alom

20-Sep-05 3:59

I am looking for a way to autoselect ListView Items on Key Press event based on the sorted column.
The behaviour should be similar to Windows explorer.

If one types the keys very fast the keys should be buffered and the buffer string should be compared with the sorted column. If the speed is slow, the buffer is cleared.

Can somebody guide me to some article on this? I tried to google but to no avail.

I know this is available on of-the-shelf ListView. But this works only for the first column.
I need this on the sorted column.

Re: Select ListView Item on KeyPress

John Fisher20-Sep-05 9:27

John Fisher

20-Sep-05 9:27

Don't have an article for you, but here is a basic implementation description:

Handle the KeyDown event for the appropriate control.
  If the last key press was not within the timeout period,
    then clear the "keys pressed" buffer (maybe a string builder).
  Add the typed key to your "keys pressed" buffer.
  Reset the keydown timer to the current time.
  Perform your comparison to select the appropriate item.

Selecting an item is very straightforward, so that shouldn't be much of a problem. If you're not sure how to do the comparing, you can do it easily by looping through the items list and comparing the substrings manually.

John

"You said a whole sentence with no words in it, and I understood you!" -- my wife as she cries about slowly becoming a geek.

-- modified at 15:28 Tuesday 20th September, 2005

Re: Select ListView Item on KeyPress

miah alom20-Sep-05 9:40

miah alom

20-Sep-05 9:40

Thanks for your reply. This should work.

Re: Select ListView Item on KeyPress

Abdullah_Hunzai22-Oct-09 20:00

Abdullah_Hunzai

22-Oct-09 20:00

I've the same issue, did you implemented the Algo to search a specific item on keys down, if so kindly guide me!!

Abdullah

Stretching a polygon side in C#

20-Sep-05 3:52

Hi,

I am drawing a three sided polygon. I declared a ArrayList variable. On mousedown i am capturing points and adding the same to Arraylist variable.

After that i am drawing lines by reading points from the Arraylist variable.
while drawing the lines i am setting the lastline lastpoint to the nextline firstpoint.

My lastpoint and firstpoint will be same meaning when i am closing the polygon i am drawing line from the thirdpoint to fourthpoint(which is same as firstpoint).

I am trying to drag the secondpoint and thirdpoint. that works fine. but if i position the mouse on the firstpoint and if i tried to drag it is not stretching by combiningthe firstline and lastlines together instead only the firstline is getting dragged.

Can anyone help me.

Thanks in advance, Beginner

Beginner

-- modified at 9:53 Tuesday 20th September, 2005

Re: Stretching a polygon side in C#

Yoyosch20-Sep-05 4:06

Yoyosch

20-Sep-05 4:06

What classes are you using exactly? CsGL?

Re: Stretching a polygon side in C#

subramanyeswari20-Sep-05 17:43

subramanyeswari

20-Sep-05 17:43

I am using system.Drawing and System.Drawing.Drawing2D libraries.

Regards

Re: Stretching a polygon side in C#

Andy Moore20-Sep-05 18:15

Andy Moore

20-Sep-05 18:15

Take a look at the System.Drawing.Drawing2D.GraphicsPath class. You can do something like this:

System.Drawing.Point pts[] = new Point[3];<br />
System.Drawing.Drawing2D.GraphicsPath gp = new System.Drawing.Drawing2D.GraphicsPath();<br />
<br />
gp.AddPolygon( pts );<br />
gp.CloseFigure();<br />

According to which points you select and drag, you would need to recompute the points in the pts[] array then regenerate the GraphicsPath.

I hope this helps.

Human beings were not meant to sit in little cubicles staring at computer screens all day, filling out useless forms and listening to eight different bosses drone on about about mission statements. -- Peter Gibbons

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