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We'll begin working on the application by first defining the data model we'll use to represent our database.I discussed how to create a LINQ to SQL data model using VS 2008's LINQ to SQL designer in Part 2 of this series.Below is a screenshot of the data model classes I can quickly create using the LINQ to SQL designer to model the "Northwind" sample database: We'll revisit our data model in Step 5 of this tutorial below when we add some business validation rules to it.But to begin with we'll just use the above data model as-is to build our UI. NET page with a control to bind the Grid View to our data model.
What this means is that I can easily databind their Supplier. Category Name sub-properties within our Grid: And now when I run the application I get the human readable Category and Supplier name values instead: To get drop-down list UI for the Supplier and Category columns while in Edit-Mode in the Grid, I will first add two additional columns we added to our Grid View earlier and customize their edit appearance (by specifying an Edit Item Template).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).Rather than show all products within the database, we can update our UI to include a dropdownlist that allows the user to filter the products by a particular category.VS 2008 includes build-in designer support to make it easy to connect up our Grid View (or any other ASP. To bind our grid above to the data model we created earlier, we can switch into design-view, select the Grid View, and then select the "New Data Source..." option within the "Choose Data Source:" drop-down: This will bring up a dialog box that lists the available datasource options to create.Select the new "LINQ" option in the dialog box and name the resulting designer will then display the available LINQ to SQL Data Context classes that your application can use (including those in class libraries that you are referencing): We'll want to select the data model we created with the LINQ to SQL designer earlier.