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The Grid View Update Event Args class has three important collections - Old Values, New Values and Keys.The Ole Values collection contains list of old column values, the New Values collection contains the list of new values entered by the user and the Keys collection contains the list of primary key values as defined by Data Key Names.Make Company Name blank and click on Update button.You should see an error message as shown in Figure 7.Set the Control To Validate and Error message properties to the appropriate values. Up till now we used the validation controls to validate Grid View input on client and server side.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.
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.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.Enter the database details as per your setup and click on OK.On the next step select Customer ID, Company Name, Contact Name and Country columns (Figure 2).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.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 will convert them from Bound Field to Template Field.Now from the smart tag of the Grid View choose "Edit Template" and then select "Edit Item Template" of Company Name column.