Asp sqldatasource onupdating

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.NET Framework 3.5 release, and which enables you to easily model relational databases using . You can use LINQ expressions to query the database with them, as well as update/insert/delete data. The simple data editing web application I'll walkthrough building in this tutorial is a basic data entry/manipulation front-end for products within a database: The application will support the following end-user features: The web application will be implemented with a clean object-oriented data model built using the LINQ to SQL ORM.Below are the first four parts of my LINQ to SQL series: control that is shipping as part of ASP. All of the business rules and business validation logic will be implemented in our data model tier - and within the UI tier or in any of the UI pages.We'll also want to select the "Advanced" button and enable updates and deletes for the datasource: When we click the "Finish" button above, VS 2008 will declare a to point to it (via its Data Source ID property).It will also automatically provide column declarations in the Grid based on the schema of the Product entity we choose to bind against: We can then pull up the "smart task" context UI of the Grid View and indicate that we want to enable paging, sorting, editing and deleting on it: We can then press F5 to run our application, and have a product listing page with full paging and sorting support (note the paging indexes at the bottom of the grid below): We can also select the "edit" or "delete" button on each row to update the data: If we flip into source view on the page, we'll see that the markup of the page contains the content below.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.

Now that we have the basics of our web UI working against our LINQ to SQL data-model, we can go ahead and further customize the UI and behavior.

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.

Important: The beauty of LINQ and LINQ to SQL is that it obviously isn't tied to being used only in UI scenarios - or with particular UI binding controls like the Linq Data Source.

Our Grid View above has a lot of columns defined within it, and two of the column values (the Supplier ID and the Category ID) are currently foreign-key numbers -- which certainly isn't the ideal way to represent them to an end-user.

declarations) or in designer mode (just click on the column in the designer and choose the "Remove" task).

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