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A foreign key lookup can be assigned with the lookup property. The way the lookup is used when editing the column value can be controled with the editControlType property. A edit lookup can be implemented with the following styles DropDownList, TextBoxLookup, AutoCompleteLookup, TextBoxSearchLookup, ListBox or RadioButtonList. In this example lookups are applied to the CatgeoryID and SupplierID columns.
Edit Lookup Type