Parameters are used to send values for insert, update, and delete operations to the data source.
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A Grid View Edit Event Args object is passed to the event-handling method, which enables you to determine the index of the current row and to indicate that the edit operation should be canceled.
event is raised when a row's Update button is clicked, but before the Grid View control updates the row.
There can be several approaches taken for validating data. For our example we are going to use Customers table of Northwind database. Open its smart tag and choose "Configure Data Source" option to start Configure Data Source wizard.
On the first step of the wizard click on "New Connection" button to open a dialog as shown in Figure 1.
Most data-bound controls allow you to configure them to support insert, update, and delete operations, and they pass the values to be updated to the data source control.