How do I display a message box in my form application?

To show the message box, call the MessageBox class’ Show() method. The message box is the modal form that notifies the user about certain event in the application and optionally takes the user feedback. The Show() is an static (C#) / Shared (VB.NET) method of the System.Windows.Forms.MessageBox class. It has a number of overloaded versions. The simplest one take the message text and display it in the message box.

C# Version

MessageBox.Show("Welcome to Win Form");

VB.NET Version

MessageBox.Show("Welcome to Win Form")

To add the title to the message box, call the MessageBox.Show() like:

C# Version

MessageBox.Show("Welcome to Win Form", "Greeting");

VB.NET Version

MessageBox.Show("Welcome to Win Form", "Greeting")

The following example code shows the message box with Yes, No, Cancel button to confirm application close and closes the application if the user selects the Yes button

C# Version

DialogResult dlgRes = null
dlgRes = MessageBox.Show(
	"Are you sure you want to close without saving the document", 
	"Confirm Document Close", 
MessageBoxButtons.YesNoCancel, 
	MessageBoxIcon.Question);
if(dlgRes == DialogResult.Yes)
{
	Application.Exit();
}

VB.NET Version

Dim dlgRes As DialogResult
dlgRes = MessageBox.Show( _
      "Are you sure you want to close without saving the document", _
      "Confirm Document Close", _
MessageBoxButtons.YesNoCancel, _
      MessageBoxIcon.Question)
If dlgRes = DialogResult.Yes Then
      Application.Exit()
End If

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