在XML中为combobox添加动态值？

I made a programm which take value from user in textbox and add that value to ComboBox that's work fine but when i closed programm it lost all information coz i did not use an array but now i want that it should add value dynamically to XML where it store permanently after closing program? plz help me how can i do thatI made a programm which take value from user in