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We'll customize each column to have a dropdownlist control when in edit mode, where the available values in the dropdownlists are pulled from the categories and suppliers datasource controls above, and where we two-way databind the selected value to the Product's Supplier ID and Category ID foreign keys: And now when end-users click edit in the Grid View, they are presented a drop-down list of all valid Supplier's to associate the product with: And when they hit save the Product is updated appropriately (the Grid View will use the Drop Down List's currently selected value to bind the Supplier ID).

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For example, we could remove the "Quantity Per Unit" column below and re-run our application to get this slightly cleaner UI: If you have used the control before and explicitly passed update parameters to update methods (the default when using Data Set based Table Adapters) one of the things you know can be painful is that you have to change the method signatures of your Table Adapter's update methods when the parameters based by your UI are modified.

For example: if we deleted a column in our grid (like above), we'd end up having to modify our Table Adapter to support update methods without that parameter.

One of the really nice things about the Currently we are displaying the foreign-key integer values in our Grid View for the Supplier and Category of each Product: While accurate from a data model perspective, it isn't very end-user friendly.

What I really want to-do is to display the Category Name and Supplier Name instead, and provide a drop-downlist while in Edit mode to enable end-users to easily associate the Supplier ID and Category ID values.

When updates are made, the LINQ to SQL ORM will automatically ensure that all business rules and validation logic we've added (as partial methods) to the LINQ to SQL data model pass before persisting anything to the database.