I've got some troubles with ListBox. I want to allow user edit selected item in ListBox, when he double click it in his application, but I wasn't able to find how to do this. Please, can someone help me with it?
ListBox class does not support editing items in runtime (at least I do not know anything about it ;-P). So you have to handle yourself... As you want to give the user opportunity to change data after double clicking use DoubleClick event of the ListBox class and add in there the code. Depending on how you want a user to provide data to the app it will look differently.
Probably the simplest way to achieve what you want is to add TextBox control to the form. Then the DoubleClick event can look somehow like this: