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Inside the event handler we added two validation conditions: We used the New Values collection to check the entered country.

If the country is null then we set Cancel property of Grid View Update Event Args class to true.

NET 2.0 Grid View control allows us to quickly edit and delete records.

However, most of the real world cases call for validating the data being edited or deleted. Drag and drop an SQL Data Source control on the web form.

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.

Click on the "Advanced" button and check the "Generate INSERT, UPDATE and DELETE statements" checkbox (Figure 3). Now that you have configured the SQL Data Source control let's bind it with a Grid View control. Open its smart tag and configure it as shown in Figure 4.

Here, we set the Data Source of the Grid View to Sql Data Source1. We also enable paging, sorting and editing features of the Grid View.

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Double click on the Custom Validator control to go into the Server Validate event handler and write the following code in it. However, at times you many need more control and flexibility than that is provided by validation controls.

In our example we will illustrate the use of Updating event for the validation purpose.

Add Grid View1_Row Updating event handler as shown below: The Row Updating event handler receives an event argument of type Grid View Update Event Args.

This tells Grid View that the event handler should be cancelled.

The New Values collection is read/write collection and in the second if condition we set the Country to India. You will find that the data is not accepted by the Grid View.

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