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By default when the Grid View controls goes in edit mode, it displays Text Boxes for entering values.You can not attach validation controls directly to these Text Boxes.

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.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.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.