MessageBox in C#

[SomersetBoy]

Hi
I am a C++ programmer but am having to do a small app in C#
I want to display a Message Box so wrote

MessageBox.Show("The diagram already exists - Do you want to overrite?", "Diagram Exists",
         MessageBoxButtons.OK, MessageBoxIcon.Exclamation);

But the compiler says
C:\VSProjects\Addin2\Class1.cs(180,29): error CS0103: The name 'MessageBox' does not exist in the current context

How can I fix this?

Graham

[dannystommen]

Make sure System.Windows.Forms is referenced.

[mariocatch]

Btw SomersetBoy, in Visual Studio you can right click on Types that you know should be right, but aren't scopped, and go to Resolve->Include namespace. It will automatically add the namespace using for you, or explicitly scope the Type in question.

[dannystommen]

Btw SomersetBoy, in Visual Studio you can right click on Types that you know should be right, but aren't scopped, and go to Resolve->Include namespace. It will automatically add the namespace using for you, or explicitly scope the Type in question.

That's indeed a nice feature in VS, but will only work if the type is referenced.

[boudino]

Stress that assembly System.Windows.Forms.dll is meant, because the namespace name is the same, but you haven't access to the namespace until you reference the assembly.

[Arjay]

That's indeed a nice feature in VS, but will only work if the type is referenced.

Yep, but that's where Msdn comes into play:

MessageBox Class

Displays a message box that can contain text, buttons, and symbols that inform and instruct the user.



Namespace: System.Windows.Forms
Assembly: System.Windows.Forms (in System.Windows.Forms.dll)