Linq submitchanges not updating database No email sign up sex chat
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.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.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.
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.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.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.