Datagrid problem - C# Discussion Boards

20-Jan-03 7:10

set the BorderStyle property to BorderStyle.None

1001111111011101111100111100101011110011110100101110010011010010
Sonork | 100.21142 | TheEclypse

Object to byte[]

Nnamdi Onyeyiri19-Jan-03 7:15

19-Jan-03 7:15

How would you go about doing such a thing? any suggestions?

1001111111011101111100111100101011110011110100101110010011010010
Sonork | 100.21142 | TheEclypse

Re: Object to byte[]

leppie19-Jan-03 7:50

leppie

19-Jan-03 7:50

What are trying to do? You can serialize it...If its a struct, then you Marshal it and read the bytes...

Who is this miscrosoft, and what devilish plans have they for us?

Re: Object to byte[]

Nnamdi Onyeyiri19-Jan-03 8:54

Draw grayed image from ImageList

19-Jan-03 8:54

well it could be a struct, it could be a class, or it could be a string. the infor has to be made into a byte[] so it can be sent off through a socket.

1001111111011101111100111100101011110011110100101110010011010010
Sonork | 100.21142 | TheEclypse

Re: Object to byte[]

leppie19-Jan-03 10:17

leppie

19-Jan-03 10:17

Then Serialize it thru the BinaryFormatter. Your class will need the Serializable attribute.

Who is this miscrosoft, and what devilish plans have they for us?

Datagrid problem

Mr BallyDaHob19-Jan-03 3:28

Mr BallyDaHob

19-Jan-03 3:28

Hi All,
I'm having a problem with the width of the columns in a datagrid. How do I get the columns in a datagrid to "auto expand" to the width of the data in the columns? I've messed around with the PreferredColumnWidth property, but it doesn't give the right results.
Any Ideas?

Wizard_0119-Jan-03 1:46

Wizard_01

19-Jan-03 1:46

Hi
How can i draw grayed image from ImageList ?

Dennny

Re: Draw grayed image from ImageList

Nnamdi Onyeyiri19-Jan-03 2:48

ScrollBars of MDI Parent Form

19-Jan-03 2:48

use the System.Windows.Forms.ControlPaint.DrawImageDisabled method.

1001111111011101111100111100101011110011110100101110010011010010
Sonork | 100.21142 | TheEclypse

Nigel H. Lin19-Jan-03 1:44

19-Jan-03 1:44

I tried to remove scrollbars of a MDI parent form by setting AutoScroll to false. However when a MDI child form is outside the range of MDI parent form. The scrollbars is appeared again. As a result, I can't find a way to design an MDI parent form as EXCEL. Can someone kindly give me an idea of this problem? I will appreciate very much.

******************************************************

Nigel H. Lin

Ph.D. Student
Department of Computer Science and Information Engineering
Tamkang University

Part Time Lecturer
Kuang Wu Institute of Technology and
St. John's & St. Mary's Institute of Technology

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Email Box : nigel@mail.topwise.com
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Stephane Rodriguez.19-Jan-03 3:48

19-Jan-03 3:48

I am afraid this behaviour is by design.

Nigel H. Lin19-Jan-03 5:11

19-Jan-03 5:11

Thank you for your kind reply.
I really appreciate for your prompt reply.

I just wonder how Microsoft can write an program like EXCEL.
In Excel, they also use MDI method to design their program; however I didn't see the scrollbars when the MDI child is over the range of a MDI parent form.
Is there really noway to solve this problem? Or can I use any WIN32 API to get rid of the auto scrollbars of MDI parent form?

******************************************************

Nigel H. Lin

Ph.D. Student
Department of Computer Science and Information Engineering
Tamkang University

Part Time Lecturer
Kuang Wu Institute of Technology and
St. John's & St. Mary's Institute of Technology

--------------------------------------------------------------------
Email Box : nigel@mail.topwise.com
******************************************************

Stephane Rodriguez.19-Jan-03 6:18

19-Jan-03 6:18

Nigel H. Lin wrote:
Is there really noway to solve this problem? Or can I use any WIN32 API to get rid of the auto scrollbars of MDI parent form?

Unfortunately no. Although you can get the window handle of the MDI container, and call an interop WIN32 function to change the window style and by the way remove the scrollbar(s), the fact is those are going to be back soon automatically because that's what the implementation of the Form class does (actually most of the layout logic is implemented there and in the ScrollableControl class it derives from).

I am afraid that if you want such thing in your app you have to write your own MDI container. Interesting topic by the way, and source code you can ultimately share with us!
Hint : derive your class from System.Windows.Forms.Control, instead of System.Windows.Forms.Form.

PS : Unlike what you say, I don't know what might be wrong with a scrollbar displayed as soon as a MDI client goes off the client area. That's safe, and it allows to reach it. Without a scrollbar, how would you get it back ?

Nigel H. Lin19-Jan-03 6:39

19-Jan-03 6:39

Thank you for your reply.
Actually, the reason for me to design such a MDI form without scrollbars is that it really doesn't look good when I first first load 2 of my MDI child forms into my MDI parent form. I tried to fit those two MDI child forms vertically and each of them occupies half height of the range of MDI parent form; however scrollbars came out and destroy the outlook of my program. I think you are right about having scrollbars is safe. I know it could be hard and difficult to accomplish this task. I just hope to find out the easy way for me to do this.

PS: I really appreciate your prompt reply. I might try what you suggested me to do.

******************************************************

Nigel H. Lin

Ph.D. Student
Department of Computer Science and Information Engineering
Tamkang University

Part Time Lecturer
Kuang Wu Institute of Technology and
St. John's & St. Mary's Institute of Technology

--------------------------------------------------------------------
Email Box : nigel@mail.topwise.com
******************************************************

Stephane Rodriguez.19-Jan-03 6:44

19-Jan-03 6:44

Nigel H. Lin wrote:
I tried to fit those two MDI child forms vertically and each of them occupies half height of the range of MDI parent form; however scrollbars came out and destroy the outlook of my program

I have to disagree, scrollbars don't need to show because of that. Why don't you tile the MDI clients instead vertically or horizontally ? Get yourself the Scribble sample (MSDEV.NET CDs), I am pretty sure you'll like it.

Nigel H. Lin19-Jan-03 15:41

19-Jan-03 15:41

Thank you for your reply again.
Here is the information related to this issue that I got from GotDotNet Community. You might want to know.

[Quote Begin]

Sorry to say but this is a bug in the 1.0 version of the framework. I 've already posted this same question in 3 different forums here on gotdotnet but no one could help or figure it out.

http://www.gotdotnet.com/Community/MessageBoard/Thread.aspx?id=20187&Page=1#20187

http://www.gotdotnet.com/Community/MessageBoard/Thread.aspx?id=20186&Page=1#20186

http://www.gotdotnet.com/Community/MessageBoard/Thread.aspx?id=20185&Page=1#20270

I finally used one of my support credits and called microsoft. It took them about 3 weeks to figure out that this was a bug in the framework. It has nothing to do with VB, C# or any other language. They said they would put the request in to fix this in the next release. I havent checked 1.1 to see if its fixed but that may solve your problem. If you're already using 1.1 then you might have to wait for the next release.

Cheers,

Reginald

Forum: C# Posted By: ReginaldHenderson

[Quote End]

******************************************************

Nigel H. Lin

Ph.D. Student
Department of Computer Science and Information Engineering
Tamkang University

Part Time Lecturer
Kuang Wu Institute of Technology and
St. John's & St. Mary's Institute of Technology

--------------------------------------------------------------------
Email Box : nigel@mail.topwise.com
******************************************************

Stephane Rodriguez.19-Jan-03 18:42

19-Jan-03 18:42

Nigel H. Lin wrote:
figure out that this was a bug in the framework.

Yes, sort of.

Global Variables

Jassim Rahma18-Jan-03 2:27

Jassim Rahma

18-Jan-03 2:27

what is the best way to save variables (login ID, etc) accross all forms without killing the PC memroy and application performance?

Jassim Rahma

Re: Global Variables

Stephane Rodriguez.18-Jan-03 3:07

18-Jan-03 3:07

jrahma wrote:
what is the best way to save variables (login ID, etc) accross all forms without killing the PC memroy and application performance?

Those things are unrelated to each other. Serializing one or more objects can be directed to flat files (see BinaryFormatter for instance), with no memory overhead.

Application performance ? Of course, if you are supposed to serialize 10000 object states 10 times each second, you are likely to have a couple issues, but isn't it up to you to write an appropriate application logic instead ? For instance, why the states of all objects should be saved if the last state has really changed for only a fraction of them.

Array of objects

lbh18-Jan-03 2:25

lbh

18-Jan-03 2:25

I'm new to C#, and can't understand what's wrong here. I'm trying to create an array of objects, but I get this error:
"Unhandled Exception: System.NullReferenceException: Object reference not set to an instance of an object."
at tht line "b[i] = new FirstClass();"
Can anyone tell me what I'm doing wrong?
Thanks in advance.
Len

public class FirstClass
{
public int a = 0;
public FirstClass()
{
}
}

public class SecondClass
{
public FirstClass[] b;
public SecondClass()
{
for (int i=0; i<16; i++)
{
b[i] = new FirstClass();
}
}
}

....
static void Main()
{
SecondClass c = new SecondClass();
....
Confused | :confused:

Re: Array of objects

Stephane Rodriguez.18-Jan-03 3:04

18-Jan-03 3:04

The array itself must be created before you use it. For instance, b = new FirstClass[100];

If you want more dynamical array creation, just use System.Collections.ArrayList instead.

Socket Question

gekoscan17-Jan-03 21:29

gekoscan

17-Jan-03 21:29

Okay I am seriously stumped....

There must be a way for a socket object to tell when it is done recieving a file... If we are just serializing a class and sending it between a client and a server and the object is 700 bytes.. How can I tell when the object is done sending...

I am sending this object over and over... So i need to know when it begins and when it ends.

Please help me out..

Please please please....

Thanks,

Steve Nelson.

Re: Socket Question

Stephane Rodriguez.17-Jan-03 21:48