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When you use Sql Data Adapter for performing updates, the Sql Data Adapter propagates the updates one by one.
That means if there are 100 rows to be updated the Sql Data Adapter will execute 100 separate operations against the database.
In this method we write sql query in our code behind page instead of writing sql stored procedure.
Save all or press "Ctrl S" and hit "F5" to run the page, the page will look as in the following image: Click on "Edit the Grid View", it will display Textboxes in each cell as in the following image: Edit the value(s) here and click on the Update link, it will update all the data or to remove it click on the "Delete" link above the image shown.
You're accessing so many items without null checks that it could be any number of things. Are you sure all of the controls exist in the cells you're specifying?