I have an web reference application which have combox added with server1 and server2 .. server2 is triggered in form load event..

when while debugging server1 or server2 class is called and its items are invoked in listbox.. as I have shown in fig.

I want to make Listbox search with TextBox. so that when user puts product number in textbox and hit enter only that product number should be searched .

please help me