Show a message box from a class in c#?

Question

How do you get a class to interact with the form to show a message box?

This isn't normally a good idea. Ideally, the class should send the data back to the form and let the form show the message box. If you code UI specifics into your class then it is completely tied to that UI. Also, it makes unit testing impossible. — NotMe, Apr 03 '09 at 19:08

score 41 · Accepted Answer · answered Apr 03 '09 at 19:03

41

using System.Windows.Forms;
...
MessageBox.Show("Hello World!");

answered Apr 03 '09 at 19:03

John Gietzen

score 15 · Answer 2 · answered Apr 03 '09 at 19:02

15

System.Windows.MessageBox.Show("Hello world"); //WPF
System.Windows.Forms.MessageBox.Show("Hello world"); //WinForms

answered Apr 03 '09 at 19:02

Mehrdad Afshari

score 4 · Answer 3 · answered Apr 03 '09 at 19:01

4

Try this:

System.Windows.Forms.MessageBox.Show("Here's a message!");

answered Apr 03 '09 at 19:01

Keith Gaughan

score 3 · Answer 4 · answered Apr 03 '09 at 19:01

3

using System.Windows.Forms;

public class message
{
    static void Main()
    {  
        MessageBox.Show("Hello World!"); 
    }
}

answered Apr 03 '09 at 19:01

Konstantin Tarkus

4 Answers4