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[quote=dks1385;273705]What,s wrong with this code: procedure TWinForm1.Button2_Click(sender: System.Object; e: System.EventArgs); var varForm:TwinForm1; begin varForm.Close; end; Error: system.NullReferenceException[/quote] You are attempting to close the form from a method of the form itself - and inside the method, you are declaring a local variable and calling it "varForm" of type TwinForm1. What's …
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