In theory I understand what's going on but I can't find any working solution. I'm not very experienced ASP.NET developer.
I have a FormView which contains some field in EditTemplate. I want to use UpdatePanel and PopupControlExtender to show a grid to lookup values from.
There are many records to select from so I want to allow user to filter grid before making selection. I've placed "FilterByTextBox" and link button to filter records inside gridview. Pretty standard design patterm as I thought.
The problem is "FilterByTextBox" is always empty in linkbutton's OnClick event. I can't get it's value. How and where I can store textbox's value to access it later in OnClick event?
FilterByTextBox, linkbutton and GridView are inside UpdatePanel. Whole page is inside master page.
Maybe there is any good example which uses my pattern?