how to program alerts and warning messages using c#.net [closed]

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how to program alerts and warning messages using c#.net

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In web? Try this:

string textForMessage = @"<script language='javascript'> alert('test\ntest\ntest\ntest');</script>";
Page.ClientScript.RegisterClientScriptBlock(this.GetType(), "UserPopup", textForMessage);

Output

Got it here