How do I create a MessageBox in C# ?

Question

I have just installed C# for the first time, and at first glance it appears to be very similar to VB6. I decided to start off by trying to make a 'Hello, World!' UI Edition.

I started in the Form Designer and made a button named "Click Me!" proceeded to double-click it and typed in

MessageBox("Hello, World!");

I received the following error:

MessageBox is a 'type' but used as a 'variable'

Fair enough, it seems in C# MessageBox is an Object. I tried the following

MessageBox a = new MessageBox("Hello, World!");

I received the following error: MessageBox does not contain a constructor that takes '1' arguments

Now I am stumped. Please help.

Answer 1

using System.Windows.Forms;

...

MessageBox.Show( "hello world" );

Answer 2

It is a static function on the MessageBox class, the simple way to do this is using

MessageBox.Show("my message");

in the System.Windows.Forms class. You can find more on the msdn page for this here . Among other things you can control the message box text, title, default button, and icons. Since you didn't specify, if you are trying to do this in a webpage you should look at triggering the javascript alert("my message"); or confirm("my question"); functions.

Answer 3

MessageBox.Show also returns a DialogResult, which if you put some buttons on there, means you can have it returned what the user clicked. Most of the time I write something like

if (MessageBox.Show("Do you want to continue?", "Question", DialogBoxButtons.YesNo) == DialogResult.Yes) {
     //some interesting behaviour here
}

which I guess is a bit unwieldy but it gets the job done.

Answer 4

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