I have placed two data combo boxes on VB form. I am accessing the list for thest combo boxes from SQL server. For first combo box i have 4 centre (a, b, c, d) and for each centre i have 50 codes. Now I want that if i select first centre from first combo box then in the second combo box only the list of that centre codes appear. please someone help me in this problem. what will be the code for this problem.