How to display a message box in C# as system modal?

Question

How to display a message box in C# as system modal, something like vbModal in Visual Basic 6?

Answer 1

Standard message box in C# is modal (cannot access rest of app until messagebox is dismissed).

http://msdn.microsoft.com/en-us/library/aa335423(VS.71).aspx

"A message box is a modal dialog, which means no input (keyboard or mouse click) can occur except to objects on the modal form. "

Edit: I am not sure about Vb6 and messagebox there. Does it use a different type of "modal"?