If the Update button is clicked, the SqlDataSource's updating workflow begins, thereby updating the database with the user's changes. At this point, we have a page with a GridView that displays the records from the Products table. When a particular record in the grid is edited, the GridView's columns switch to their editing interface. How do you do this? The BoundField has a property named ReadOnly. In particular, BoundFields turn into TextBox Web controls; CheckBoxFields, which are displayed as unclickable checkboxes in the read-only status, become clickable. When the visitor clicks the Edit button that row becomes editable. But for simpler scenarios where the data is being pulled from exactly one table and the fields returned in the SelectCommand are precisely the set of columns to be edited, the autogeneration feature may save time. We'll see how to accomplish this in a future installment as well.
The CommandField is a column that shows Edit-related or Delete-related buttons, depending on its property settings. But for simpler scenarios where the data is being pulled from exactly one table and the fields returned in the SelectCommand are precisely the set of columns to be edited, the autogeneration feature may save time. Likewise, the GridView control handles the task of generating the editing interface and assigning the user's entries to the data source's UpdateParameters. As you can see in the screenshot above, the ProductID column is not editable. Recall that when using manually-created Web Forms in the inserting and deleting scenarios, we would use ControlParameter objects that referenced the particular Web control that held the parameter's value. If the GridView's underlying data source has an UpdateCommand specified as our's does , then the GridView's smart tag will include a checkbox titled "Enable Editing. Despite the change, the CategoryName value is the same as it was prior to editing the row. It is possible to add validation Web controls to the GridView's editing interface. You might think that you could just change the CategoryName value. If you view this page in a browser, your screen should look similar to the following screenshot: This is because there is no CategoryName parameter in the SqlDataSource and because the Products database table doesn't even have a CategoryName column, as it comes from the Categories table. The screenshot below shows the GridView when one of its record's Edit buttons has been clicked. There has been a postback and the selected row is now editable. What checking this checkbox does is add a CommandField to the GridView's field list. Go ahead and edit a record and put in a different value for its CategoryName field and then click Update. We'll see how to accomplish this in a future installment as well. If a table being edited has foreign keys to other tables - like the CategoryID in the Products table - then the default editing interface is rather lacking. When the visitor clicks the Edit button that row becomes editable. To see why, try editing a record and changing its category. Conclusion In this article we looked at how to use the SqlDataSource and GridView controls to update data from a database. At this point, we have a page with a GridView that displays the records from the Products table. However, this option is only available if the SelectCommand returns the primary key column s in its select list and if all of the columns are returned from a single table. It then automatically starts the SqlDataSource's updating workflow, which causes the database to be updated. After updating the data, the GridView is returned to its pre-editing state. Currently, the CategoryID value's editing interface is rendered as a TextBox, meaning if you want to change a product's category from, say, Beverages to Dairy, you need to change its CategoryID value from 1 to 4.
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