Currently, I am doing a project. I don't know how to pass a value from one windows form to another windows form using c#.net. Suppose, I have two form: parent form and child form. Parent form consists of a datagridview now datagridview cell click child form is open Now in child form also a Datagridview containing the three columns last one is checkbox. when i checked the checkbox I want to pass selected item (Selected row and column 2 value) of datagridview to my parent datagridview form without closing the child form.