Object set to null refrecce

Question

Hi , friends

I am facing a problem in windows application in C#.net 2.0

scenario is , i hav a public int variable in a form's class , and from that i am opening a dialog form and from that dialog form i am assigning value to that variable but , at run time i get an error "Object is not set to an insatance of an object "

please tell me where i am wrong


waiting for reply ....................................................................