Asp net rowupdating newvalues
Step 6 explores techniques for updating the brochure information while Step 7 looks at updating the picture.As discussed in the An Overview of Inserting, Updating, and Deleting Data tutorial, the Grid View offers built-in row-level editing support that can be implemented by the tick of a checkbox if its underlying data source is appropriately configured.The Grid View and Object Data Source provide events that fire both before and after the delete command has been performed.We actually need to create event handlers for both the pre- and post-action events.When editing a category, the user will be able to optionally upload a new picture or have the category continue to use the existing one. In this tutorial we will extend the Grid View to include editing and deleting support.For the brochure, they can either choose to use the existing brochure, to upload a new brochure, or to indicate that the category no longer has a brochure associated with it. The DAL has auto-generated s header and choose Add Query from the context menu to launche the Table Adapter Query Configuration Wizard. Rather than continuing to work from page from the previous tutorial.Before the record is deleted we need to determine its PDF file s path, but we don t want to delete the PDF before the category is deleted in case there is some exception and the category is not deleted.The Grid View s // A page variable to "remember" the deleted category's Brochure Path value string deleted Categorys Pdf Path = null; protected void Categories_Row Deleting(object sender, Grid View Delete Event Args e) protected void Categories_Row Deleted(object sender, Grid View Deleted Event Args e) , then the PDF is deleted from the file system.
Since we re creating a query to add a new record to the (Click to view full-size image) In addition to updating the DAL, we need to update the BLL to include methods for updating and deleting a category. Currently the Object Data Source the Grid View is bound to () does not support deleting.
My test category, shown in Figure 6, includes a test brochure file named and a test picture.
Figure 7 shows the Grid View after the test category has been added.
The data is then rebound to the Grid View and the markup is sent back to the client with the Test Category no longer present.
While the delete workflow successfully removed the Test Category record from the File Was Not Deleted from the Web Server s File System One of the downsides of storing binary data external to the database is that extra steps must be taken to clean up these files when the associated database record is deleted.
Because of the , resulting in the addition of an Edit button (and Update and Cancel buttons for the row being edited).