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Posted by / 14-May-2020 17:17

Linq submitchanges not updating database

The easiest way to-do this is by selecting the “Configure Data Source” option in the Grid View smart task: This will bring me back to the control’s design-time UI that we used at the very beginning of this tutorial.

I can select the “Where” button within this to add a binding filter to the datasource control.

As you’ve seen in my previous posts in this series, writing code using the LINQ to SQL ORM is extremely clean.

You can always write custom UI code to directly work against your LINQ to SQL data model if you prefer, or when you find a UI scenario that isn’t particularly suited to using the control to build the web application scenario I defined above.

NET control that implements the Data Source Control pattern introduced with ASP. It is similar to the Object Data Source and Sql Data Source controls in that it can be used to declaratively bind other ASP. Where it differs is that instead of binding directly to a database (like the Sql Data Source) or to a generic class (like the Object Data Source), the on my page that points to my LINQ to SQL datacontext class, and identify the entities (for example: Products) in the LINQ to SQL data model I want to bind against.

I could then point a Grid View at it (by settings its Data Source ID property) to get a grid-like view of the Product content: Without having to-do anything else, I can run the page and have a listing of my Product data with built-in support for paging and sorting over the data.

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.

Because we already added a control to the page earlier that references our Categories within our LINQ to SQL data model, all I need to-do to create a drop-downlist control at the top of the page that binds against this.

For example: When I run the page I’ll now get a filter dropdownlist of all categories at the top of the page: My last step is to configure the Grid View to only show those Products in the category the end-user selects from the dropdownlist.

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.

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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.

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