When using search on a KTDatatable, it seems you cant search on the ID with integer values. I tried various things like adding a second column and use a template to fake a new column. Even then search does not trigger on integers.
Same issue for me. It's important becouse I want to sort it by ID desc then I must use ID. I did it from controller by adding OrderByDescending LinQ query but didn't work. I don't know if there is any other solution.