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When we examined inserting data and deleting data we looked at doing so both through manually-created Web Forms and through data Web controls, like the Grid View or Details View.
In the manually-created Web Forms example for inserting, for example, we added Text Boxes, Drop Down Lists, and other Web controls to collect the values for the new record.
Once they've selected this record, you need to show it's existing values in editable fields (textboxes, cehckboxes, and so on), let the user make any modifications, and then save them.
We can easily create the Web controls necessary to facilitate an editing interface and it is simple enough to use a Sql Data Source control with appropriate Update Parameters to execute the appropriate statement with values based on the Web controls' values.
To demonstrate this functionality, let's look at using a Grid View to list all of the records from the SELECT [Product ID], [Product Name], [Products].[Category ID], [Category Name], [Unit Price], [Discontinued] FROM [Products] INNER JOIN [Categories] ON [Products].[Category ID] = [Categories].[Category ID] ORDER BY [Product Name] can be specified through the data source's wizard, via the Select Query property in the Properties window, or declaratively.
Previous installments in this article series have covered these steps in detail.
What checking this checkbox does is add a Command Field to the Grid View's field list.
The Command Field is a column that shows Edit-related or Delete-related buttons, depending on its property settings.
Checking "Enable Editing" adds a Command Field with its property set to True. When the visitor clicks the Edit button that row becomes editable.
In particular, Bound Fields turn into Text Box Web controls; Check Box Fields, which are displayed as unclickable checkboxes in the read-only status, become clickable.
This interface allows the user to make changes to the selected row's values.
Updating data through manually-created Web Forms is a bit more difficult and less practical because the Web controls that make up the updating interface must also be populated with the values of the record being edited.