How to place a required field validator inside a GridView TextBox

Question

I have a GridView with some TemplateField items containing TextBox controls. I would like to add a required field validator on it. This is

Answer 1

In the Edit template, add a RequiredFieldValidator like this:

Here is the reference for the RequiredFieldValidator on MSDN.

UPDATE:

If you wanted a regular expression validator, its pretty much the same, but with the RegularExpressionValidator control:

Here is a complete list of the functionality for the RegularExpressionValidator on MSDN.