I have a stupid problem but not able to find solution :(

I have repeater that create user control (WebUserControl 1) . I pass parameter (InterationStri ng) to user control that is "Container.Data Item" of repeater.

When Usercontrol postback page (autopostback=t rue on dropdownlist), UserControl lose parameter value. InterationStrin g is correctly set on first loading but on postback, IterationString property is...