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.If the Cancel button is clicked, the row reverts to its pre-editing interface and any changes are not saved.If the Update button is clicked, the Sql Data Source's updating workflow begins, thereby updating the database with the user's changes.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.For example, to let a visitor edit a database record you first need to let them choose which record to edit.AND Primary Key Column Name N = @Primary Key Value To Update N , in this instance - has its value specified via the data source control's Select Parameters, which can specify a source for the parameter value.The source may be: a hard-coded value like "3.95", which would return all products less than .95; the value of a Web control on the page, allowing the user to enter a price bound in a Text Box; from the querystring; from session state; and so on.
This interface allows the user to make changes to the selected row's values.
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.
This article is one in a series of articles on ASP. In particular, we look at enabling editing support in the Grid View. This article focuses on the Sql Data Source control; for a detailed look at updating with the Object Data Source, refer to the "Editing, Inserting, and Deleting" tutorials in my Working with Data in ASP. Let's explore the updating "action" for the Access Data Source and Sql Data Source controls in more detail.
NET 2.0 introduces three new data Web controls: the Grid View, the Details View, and the Form View.
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Future installments will explore more advanced updating scenarios, such as customizing the Grid View's editing interface and programmatically setting the updated values. The UPDATE Table Name SET Column Name1 = @Parameter Value1 Column Name2 = @Parameter Value2 ...