ih ave one table called codemster in that table i have two fileds codetype and codedesc codetype is ...

Question

ihave one table called codemaster in that table i have two fields code type and codedesc codetype is in drop down list and codedesc is in textbox both data type are varchar.when i select area in codetype all are displayed.i have antoher design customer registration in that area have one field is in dropdown list in that dropdown list codemaster table areas  have to come in that dropwdown list how to do help me please