Code in article How To: Creating Dialogs in .NET

Question

Hi, Doesn't work for me. Using Visual Studio 2003 Enterprise Architect. http://www.c-sharpcorner.com/Code/2003/Dec/DialogTutorial.asp When I run the code I get this error: An unhandled exception of type 'System.NullReferenceException' occurred in WorkingWithDialogs.exe Additional information: Object reference not set to an instance of an object. on this line: TheParentForm.ShowCustomerName(this); in private void OKButton_Click