Web Reference: The following code example shows how to use a MessageBox to inform the user of a missing entry in a TextBox. This example requires that the method is called from an existing form with a TextBox named ServerName on it. 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. Learn how to create a custom message box in a Windows Forms application using C#. This step-by-step guide covers everything from designing the message box to implementing it in your WinForms project.
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