How to use MessageBox in Win Server 2008 R2 using ASP.NET C#

Question

I want to show any type of message using MessageBox in Windows Server 2008 R2 with ASP.NET using C#.

 

I use bellow this code:

 

MessageBox.Show("Registration Successfully Completed", "Success!!", MessageBoxButtons.OK, MessageBoxIcon.Information);

But show error:(bellow):

 

Showing a modal dialog box or form when the application is not running in UserInteractive mode is not a valid operation. Specify the ServiceNotification or DefaultDesktopOnly style to display a notification from a service application.

 

 

Please solve this problem.