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We will use the Custom Validator control for this purpose.Just like we attached the Required Field Validator control to the Text Box, attach a Custom Validator to the Contact Name column. If you run the web form and try entering wrong value in the Contact Name column then you will see the error message displayed as before and the value will not be accepted by the Grid View control.

asp net gridview rowupdating boundfield-16

Asp net gridview rowupdating boundfield

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.

Out of these events Row Updating and Row Deleting are possibly the most common ones.

These events are raised before updating and deleting the record respectively.

Right click on the Grid View and select "End template editing" Run the web form.