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Message: [QUOTE="afh, post: 179789, member: 54966"] I've a DataGridView based on PROD_PACKING table. The type of PARENT_PACK_ID column is changed to Combo Box. To populate its values I defined a custom query [B]getPackings(product_id)[/B] inside the [B]prod_packingTableAdapter [/B]that returns PACK_ID, PACK_TYPE based on PRODUCT_ID parameter. [CODE] PACK_ID primary key auto increment value PACK_TYPE for packing type e.g. Carton, Box, Unit PARENT_PACK_ID self join to PACK_ID CONV_UNITS # of units within parent pack PRODUCT_ID refers to PRODUCT table [/CODE] How I may change DataSource of the PARENT_PACK_ID combobox column of DataGridView. [/QUOTE]