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MessageBoxDefaultButton Enumeration

Specifies constants defining the default button on a MessageBox.

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

public enum MessageBoxDefaultButton

Member nameDescription
Button1The first button on the message box is the default button.
Button2The second button on the message box is the default button.
Button3The third button on the message box is the default button.

This enumeration is used by the MessageBox class.

The following code example demonstrates how to display a MessageBox with the options supported by this overload of Show. After verifying that a string variable, ServerName, is empty, the example displays a MessageBox with a question box icon, offering the user the option to cancel the operation. The example uses the RightAlign member of the MessageBoxOptions enumeration to align the text to the right edge of the dialog box. If the Show method's return value evaluates to Yes, the form that displayed the MessageBox is closed.


	private void validateUserEntry2()
	{

		// Checks the value of the text. 

		if(serverName.Text.Length == 0)
		{

			// Initializes the variables to pass to the MessageBox.Show method. 

			string message = "You did not enter a server name. Cancel this operation?";
			string caption = "No Server Name Specified";
			MessageBoxButtons buttons = MessageBoxButtons.YesNo;
			DialogResult result;

			// Displays the MessageBox.

			result = MessageBox.Show(this, message, caption, buttons,
				MessageBoxIcon.Question, MessageBoxDefaultButton.Button1, 
				MessageBoxOptions.RightAlign);

			if(result == DialogResult.Yes)
			{

				// Closes the parent form. 

				this.Close();

			}

		}

	}

.NET Framework

Supported in: 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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