changing the text colour in datagrid row (C#) - C# Discussion Boards

Can we use C# for programing Graphics Environments?

Kiran Satish13-Dec-04 5:53

13-Dec-04 5:53

Hi all,

I am having a doubt, whether we can use C# for programming graphics environments instead of using OpenGL. I am not familiar with OpenGL, I have tried a couple of times to learn it, but not interested. But rather i am more interested in learning C#, if we can develop graphics environments in C#. I want to develop some simple applications like creating an environment(Ex: room) with objects like sphere, cube, pyramid etc...)

The main question is can we use C# for developing the applications that we develop using OpenGL?

Thanks in advance,
Suman.

Suman

Re: Can we use C# for programing Graphics Environments?

Dave Kreskowiak13-Dec-04 6:08

Dave Kreskowiak

13-Dec-04 6:08

A moot question considering your comparing apples and oranges. C# is a general purpose language for writing applications while OpenGL is an API Library, not a language.

You can use C# to write a graphics environment and have it call OpenGL functions to actually draw the visuals on screen.

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

Re: Can we use C# for programing Graphics Environments?

Anonymous13-Dec-04 6:24

Anonymous

13-Dec-04 6:24

Hi,

yep thts wht i am asking/looking for, can't we draw visuals on screen using C# alone without OpenGL?

Suman.

Re: Can we use C# for programing Graphics Environments?

Dave Kreskowiak13-Dec-04 9:58

Dave Kreskowiak

13-Dec-04 9:58

C# doesn't have any drawing functions. If your talking about drawing without using a non-Microsoft API, then your talking about GDI+. In C#, or any other language targeting the .NET Framework, the basic functionality is encapsulated by the System.Drawing namespace.

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

OleDbConnection question

Dirso13-Dec-04 4:56

Dirso

13-Dec-04 4:56

Hi,

Why does this code raise an exception?

<br />
OleDbConnection m_adoConn;<br />
OleDbCommand cmdPrj = new OleDbCommand("SELECT * FROM project", m_adoConn);<br />
OleDbDataReader readerPrj = cmdPrj.ExecuteReader();<br />
while(readerPrj.Read())<br />
{<br />
  OleDbCommand cmdUp = new OleDbCommand("UPDATE project SET PrjName=\"TESTE\"", m_adoConn);<br />
}<br />
readerPrj.Close();<br />

The exception message is: "There is already an open DataReader associated with this Connection which must be closed first"
My main question is "WHY?" - is there anyway to keep the datareader opened, so i can change or insert some data to the current database (where the connection is pointing to)?

Thank u very much,
Dirso

Re: OleDbConnection question

Heath Stewart13-Dec-04 5:19

Heath Stewart

13-Dec-04 5:19

The exception is quite clear: you can only have one DataReader open per connection. And how would keeping the DataReader open help you update the records? This isn't ADO - it's ADO.NET and it does work a little differently. The OleDbCommand.ExecuteNonQuery is how you update data, or you could use a DataSet and a DataAdapter derivative (in your case, using an OleDbDataAdapter) to fill and update data. A DataSet is a disconnected recordset that contains tables with column definitions, change tracking, serialization support (in .NET 1.x, only to XML; in .NET 2.0, to XML and binary), and even referential integrity.

Read in the .NET Framework SDK about the DataSet class and the DataAdapter class, both of which include examples in the class and their members' documentation topics.

This posting is provided "AS IS" with no warranties, and confers no rights.

Software Design Engineer
Developer Division Sustained Engineering
Microsoft

[My Articles] [My Blog]

Re: OleDbConnection question

Skynyrd13-Dec-04 5:36

Skynyrd

13-Dec-04 5:36

A DataReader needs exclusive access to its connection and will not be able to share it with anything else while its open. If u need to execute some other query while a reader is active you will have to create a new connection.

changing the text colour in datagrid row (C#)

steve_rm13-Dec-04 4:07

steve_rm

13-Dec-04 4:07

Hello,

I have a datagrid with books, when the book is overdue i want it to change the text to Red. A for has been used to go through each row (works fine). But when it comes to a book that is overdue, l want it to change the text to red. I have tired using the code below, but does not work.

if ( dateDue < todaysDate )<br />
{<br />
grdBookOnLoan.Select(i); //i For loop counter<br />
grdBookOnLoan.ForeColor = Color.Red;<br />
grdBookOnLoan.UnSelect(i);<br />
}

Thanks in advance,

Steve

Re: changing the text colour in datagrid row (C#)

tojamismis13-Dec-04 6:16

tojamismis

13-Dec-04 6:16

You might try adding an extra hidden column into the datagrid, a boolean that indicates whether the book is overdue. Then use the "OnPreRender" in your html markup to execute a method that checks if the book is overdue and changes the forecolor of the object if it is.

code works something like this

<br />
<asp:Label id="myLabel" runat="server" OnPreRender="CheckOverdue"/ ><br />
<br />

In your codebehind

<br />
public void CheckOverdue(object sender, EventArgs e)<br />
{<br />
   System.Web.UI.Controls.Label lbl, lblIsOverdue;<br />
   //Get the label that raised this event<br />
   lbl = (System.Web.UI.Controls.Label)sender;<br />
   //Find the label that tells if this book is overdue<br />
   lblIsOverdue = (System.Web.UI.Controls.Label)e.Item.Items.FindControl("lblIsOverdue");<br />
<br />
   //Now we determine whether the book is overdue<br />
   if(lblIsOverdue.Text == "true")<br />
   {<br />
      lbl.ForeColor = Color.Red;<br />
   }<br />
}<br />

And that should do it. Please note that this code works on a label by label basis, not a row by row. I'm not sure what this type of method does to scalability or load times (never used it in an enterprise app). So if this is for a large app, you might want to load test with and without.

Hope that helps.

Tojamismis
A mind never grows without mistakes and questions.

SqlMoney Type

webhay13-Dec-04 4:03

webhay

13-Dec-04 4:03

hi all ,

I store a data in sql with sqlmoney type but when i try to divid sqlmoney value it give me error that it cant apply this operans with sqlmoney

SqlMoney salary;

salary/2;

please help
hay Frown | :(

Re: SqlMoney Type

Stefan Troschuetz13-Dec-04 4:25

Stefan Troschuetz

13-Dec-04 4:25

The second operand has to be a SqlMoney structure too. Take a look at the documentation for more information regarding division of SqlMoney.

www.troschuetz.de

DirectX.Capture Class Library

gacuna13-Dec-04 3:28

gacuna

13-Dec-04 3:28

Ok, i'm trying the DirectX.Capture Class Library and it itsn't working.

i have a problem here because hr=1 after this

hr = enumDev.CreateClassEnumerator( ref category, out enumMon, 0 );

so it doesn't enter this "if"

if( hr != 0 )
throw new NotSupportedException( "No devices of the category" );

can anybody tell me what this means

Thanks,

Soap Extension

Uma Shankar Ladha13-Dec-04 3:10

Uma Shankar Ladha

13-Dec-04 3:10

Hi.

I want to know if there is any material availbale in the internet regarding soap extensions. I have a project where i have to construct the soap message by myself. so it would be very useful for me, if somebody can guide me to that.

Thanks

Namespace across multiple files

wweiss125813-Dec-04 2:54

wweiss1258

13-Dec-04 2:54

All,

I'm new to C#, coming from a C++ background. Is it possible to have a single namespace span multiple files and if so how?

Thanks,
Bill Weiss

Re: Namespace across multiple files

Stefan Troschuetz13-Dec-04 2:59

Stefan Troschuetz

13-Dec-04 2:59

Yes, it is.

File 1 (MyClass1.cs):
namespace MyNamespace
{
class MyClass1
{
}
}
File 2 (MyClass2.cs):
namespace MyNamespace
{
class MyClass2
{
}
}

www.troschuetz.de

Change font of messagebox

wk_vigorous13-Dec-04 2:08

wk_vigorous

13-Dec-04 2:08

Hi, guys and girls

How can I change the font of text displayed in a MessageBox?

Thanks

vigorous

Re: Change font of messagebox

Stefan Troschuetz13-Dec-04 3:02

Stefan Troschuetz

13-Dec-04 3:02

AFAIK you cannot.
But it should be pretty simple to write your own MessageBox, which provides this feature.

www.troschuetz.de

Re: Change font of messagebox

Dave Kreskowiak13-Dec-04 4:31

Dave Kreskowiak

13-Dec-04 4:31

Like Stephen said, you can't change the font in a message box put by the function call. You'll have to write your own MessageBox class, just a Form really, and format it the way you like.

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

IS THIS A PATCH IN DATETIME CONTROL?

manivannan.p13-Dec-04 1:27

manivannan.p

13-Dec-04 1:27

hello,am a new user to .NET. when i use a datetimepicker ( format set to short), along with some more controls in a form, the first time i executed the project, Iam able to get the focus in the Datetimepicker control(by pressing tab).

But if u select a new value in the control and use tab again am not getting the focus in datetime control. IS THIS A PATCH IN DATETIME CONTROL?

But when u click on it , the mousedown event makes the selection. so, iam thinking of invoking the mousedown evnet in the Enter Event(when the control is active by pressing tab). But not sure how to do it. or is there any other way of achiveing this?

Please help me at the earliest. Much Thanks.

Regards,Manivannan.P

C# custom listbox, don't know where to find

Anonymous13-Dec-04 1:04

Anonymous

13-Dec-04 1:04

Does anyone know of a custom listbox that supports multiline and multicolumn with headers? An example of what I'm thinking of

1 Error request          Priority: High
  user complaining of

2 Error request2         Priority: High
  bad data and other

Column1: Numbers
column2: Error request header with multiple lines underneath different font.
Column3: Additional info

So on and so on. I saw something like this. I have searched everyday for a custom listbox or maybe even a treeview with multiline listview like this. I am out of ideas on what other words I could google for. If anyone has encountred any custom control like this, please reply.

Re: C# custom listbox, don't know where to find

Skynyrd13-Dec-04 7:02

Skynyrd

13-Dec-04 7:02

Try the ListView control, setting the View property to Details. Then just use the Columns collection property to create all the fields u need.

Re: C# custom listbox, don't know where to find

georgexie168814-Feb-05 11:23

georgexie1688

14-Feb-05 11:23

Check this out:

http://www.codeproject.com/cs/combobox/multicolumnlistbox.asp[^]

problem integrating unmanaged C/C++ with C#

pelos12-Dec-04 23:25

pelos

12-Dec-04 23:25

hi forum,

I want to integrate an old C application with a C# library (dll). I know there are various alternatives but i have choosen the "managed C++ extensions" way.
What i do is to modify the compiler options by adding the /clr option and to recompile the old C application... but the compilation returns this error:

Command line error D2016 : '/YXstdafx.h' and '/clr' command-line options are incompatible

do u know what is the problem and its solution?

I am using Visual Studio .NET 2002 (.NET Framework 1.0)

Thanks in advance!

Sergio.

Re: problem integrating unmanaged C/C++ with C#

pelos13-Dec-04 2:13

pelos

13-Dec-04 2:13

hi,

I have solved the problem by setting the "Not Using Precompiled Headers" option, but now i have got another problem: I dont know how to use the imported C# dll.

What i do is to copy the c# dll in the "debug" folder. Then, I set the path of the "debug" folder in the "resolve #using reference" project property and finally, I import in the C++ program the C# dll by using the #using directive:

#usign "MyDLL.dll"

But now, how can I create an object contained in the DLL?

Thanks a lot!!

Sergio.

Re: problem integrating unmanaged C/C++ with C#

Dave Kreskowiak13-Dec-04 4:22

Dave Kreskowiak

13-Dec-04 4:22

Your question belongs in the C++ Forum, not C#. If your trying to use the C# .DLL in Mnaged C++, it's a question for the Managed C++ Forum.

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

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