I have two comboboxes in VB.NET. One is to display State from state table and another is used to display districts from district table. When i select a partiular state districts corresponding to that state only needs to be displayed.The problem is at the time of databinding combobox control what query i need to place in the Query builder of TableAdapter Configuration Wizard so that if i select a particular state districts corresponding to that state only needs to be displayed. I tried with creating SQL Dataadapters and datasets manually but it doesn't work out. Also i tried various types of SQL Server joins in Query Builder of TableAdapter Configuration Wizard but it doesn't work out. So pls help me regarding this problem.