ASP.NET 4 Unleashed

Creating a ValidatedField

In this final section, we create a ValidatedField custom field, which automatically validates the data that a user enters into GridView when editing a record. ValidatedField uses RequiredFieldValidator to check whether a user has entered a value, and CompareValidator to check whether the value is the correct data type (see Figure 11.25).

Figure 11.25. Using ValidatedField to edit a record.

ValidatedField is a composite field. The field contains three child controls—a TextBox, RequiredFieldValidator, and CompareValidator—wrapped up in a container control.

The code for the ValidatedField is too long to include in this ...