In order to use the MessageBox.Show( ) method, you need to not only add a reference to the namespace which includes the class, but also add a using directive to the program statements.

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Quizplus · Accepted Answer

The MessageBox class is part of the System.Windows.Forms namespace, so in order to use it, we need to add a reference to that namespace. Additionally, we need to add a using directive to the program statements in order to avoid having to fully qualify the name of the MessageBox class every time we use it.

In Order to Use the MessageBox