ce .net - Random File Access

Question

Hi, I'm trying to write a program for a hand held device that has windows ce .net v4.2. I'm using vb .net to write the program. The problem i'm having at the moment is trying to use fileopen for random access. The help says that the function is not supported for Smart Devices. The only solution at the moment is stream reader, which is really not a solution. I really need to open the file using random access, as you can imagine trying to search for an item in an item file that contains 20000 items may take a while. Any help would be greatly appreciated. Regards, Meng Chey