C# how do I pass text from form1 to form2 when "both forms are open" : I have two forms "which are both open". I want to send a datagridview cell value from form 1 (already open) to form 2 (already open). (I don't want to pass text on form load, but after some edits on the already open form). I've searched the web for days but I can't find one for already open forms. (Only those containing form.show() property).