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The following markup shows the declarative syntax for the By clicking the "Convert this field into a Template Field," Visual Studio has created a Template Field whose templates mimic the user interface of the converted Bound Field.You can verify this by visiting this page through a browser.The Grid View and Details View controls in the examples we've explored over the past three tutorials have all been composed of Bound Fields and Check Box Fields (the field types automatically added by Visual Studio when binding a Grid View or Details View to a data source control through the smart tag).When editing a row in a Grid View or Details View, those Bound Fields that are not read-only are converted into textboxes, from which the end user can modify the existing data.You can setup the Command Argument to store the row’s index for use in your code behind.event is raised when the hyperlink to sort a column is clicked, but before the Grid View control handles the sort operation.While this exception can be gracefully handled as demonstrated in the previous tutorial, ideally the editing or inserting user interface would include validation controls to prevent a user from entering such invalid data in the first place.In order to provide a customized editing or inserting interface, we need to replace the Bound Field or Check Box Field with a Template Field.
NET provides five built-in validation controls that are designed to be used to validate the value of a single input control: For more information on these five controls, check out the Validation Controls section of the ASP. For our tutorial we'll need to use a Required Field Validator in both the Details View and Grid View's Note While ASP.This enables you to provide an event-handling method that performs a custom routine, such as canceling the sorting operation, whenever this event occurs.A Grid View Sort Event Args object is passed to the event-handling method, which enables you to determine the sort expression for the column and to indicate that the selection operation should be canceled.Similarly, when inserting a new record into a Details View control, those Bound Fields whose (the default) are rendered as empty textboxes, into which the user can provide the new record's field values.
Likewise, Check Box Fields, which are disabled in the standard, read-only interface, are converted into enabled checkboxes in the editing and inserting interfaces.You'll find that the appearance and behavior of the Template Fields is identical to the experience when Bound Fields were used instead.When constructing data entry forms, it is important that users enter any required fields and that all provided inputs are legal, properly-formatted values.Specifically, this tutorial takes the example created in the Examining the Events Associated with Inserting, Updating, and Deleting tutorial and augments the editing and inserting interfaces to include appropriate validation.