Passing Parameters to form

I am trying to figure out how to pass parameters to a form before the form is displayed. For instance I am opening 1 form from another form: Form g = new frmMainForm(); g.ShowDialog() ; In VB 6 I would create properties with PropertyGet and ProperyLet and would set for instance the value of a property before opening the form: Form g = new frmMainForm(); g.UserID = 1; g.ShowDialog() ; How can I accomplish making the property UserID a property and making it accessible when instantiating this form. I tried using the get and set Accessors but that doesn't seem to work.