I have a WinForms application (VS 2008, .NET 3.5) that has a form with two different group boxes, and inside of each group box are different sets of radio buttons. When I r
I've had this issue, too. I just manually set all RadioButton objects to .Checked = False in the Form_Shown event. Note that it has to be after the Form_Load event or it won't work, and the RadioButton will be set with a default.