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To add validation controls to the editing and inserting interfaces, the Bound Fields used by the Details View and Grid View controls need to be converted into Template Fields.
To achieve this, click on the Edit Columns and Edit Fields links in the Grid View and Details View's smart tags, respectively.
There, select each of the Bound Fields and click the "Convert this field into a Template Field" link.
Figure 3: Convert Each of the Details View's and Grid View's Bound Fields Into Template Fields (Click to view full-size image) Converting a Bound Field into a Template Field through the Fields dialog box generates a Template Field that exhibits the same read-only, editing, and inserting interfaces as the Bound Field itself.
When constructing data entry forms, it is important that users enter any required fields and that all provided inputs are legal, properly-formatted values.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.
To help ensure that a user's inputs are valid, ASP.