System.Windows.Forms namespace

[Alex]

Hi,

I'm completely new to C#, so here is my question:

Why my C# program (COM dll which I can call from C++ application)
cannot see namespace

System.Windows.Forms..

When I'm typing in "using System..." after the System. the only "W"
prompt is Web, so I cannot use in my program something like
MessageBox.Show( "blah, blah, blah" );

Thanks,
Alex

 

[Glenn]

Alex

Have you referenced System.Windows.Forms dll in VS solution explorer (if
your using VS of course).

HTH

Glenn

 

[Alex]

Glenn, thanks for the quick answer,

Yes, I'm writing my project using VS 2005. So currently I have in my
..cs file

using System;
using System.Runtime.InteropServices;
using System.IO;
using System.Collections.Generic;
using System.Text;

with no problem..., but ...System.Windows is not available on some
reason...

 

[Lebesgue]

Right click on References in solution explorer and click Add new reference.
Then choose System.Windows.Forms.dll from the list and you are done.

 

[Alex]

OK, I've figured it myself, I had to go in Project->Add Reference and
add:
System.Windows.Forms.... now everything is fine. I just don't
understand why this namespace was not included in my project
automatically...

 

[Lebesgue]

It depends on the project template. System.Windows.Forms.dll is referenced
only when you create a Windows Application project

 

[Jianwei Sun]

Because it's not essential for everybody, not many people want it
included unless you have an explicit need for that..

 

[Claes Bergefall]

Maybe the MessageBox was just an example, but just in case that's what you
intend to use:
Throwing up a MessageBox from inside an inproc COM object will rarely (never
IMHO) be a good idea.

/claes