Occurs when a button is clicked in a GridView control.
Assembly: System.Web (in System.Web.dll)
The event is raised when a button is clicked in the GridView control. This enables you to provide an event-handling method that performs a custom routine whenever this event occurs.
Buttons within a GridView control can also invoke some of the built-in functionality of the control. To perform one of these operations, set the CommandName property of a button to one of the values in the following table.
Puts the current record in edit mode. Raises the RowEditing event.
Performs a paging operation. Sets the CommandArgument property of the button to "First", "Last", "Next", "Prev", or a page number to specify the type of paging operation to perform. Raises the PageIndexChanging and PageIndexChanged events.
Although the event is raised when a button listed in the previous table is clicked, it is recommended that you use the events listed in the table for the operation.
A GridViewCommandEventArgs object is passed to the event-handling method, which enables you to determine the command name and command argument of the button clicked.
To determine the index of the row that raised the event, use the CommandArgument property of the event argument that is passed to the event. The ButtonField class automatically populates the CommandArgument property with the appropriate index value. For other command buttons, you must manually set the CommandArgument property of the command button. For example, you can set the CommandArgument to <%# Container.DataItemIndex %> when the GridView control has no paging enabled.
For more information about handling events, see Consuming Events.
A Visual Studio Web site project with source code is available to accompany this topic: Download.
The following example demonstrates how to use the event to update the price of a product when a row's button is clicked. This example has the paging functionality enabled for the GridView control and sets the CommandArgument property of the Button control to the appropriate row index.