7.5. Validation controls
Validation controls are used along with an input control to test what the user enters for that input control. Validation controls can check for a required field, test against a specific value pattern of characters, and so on.
Only a subset of HTML and web server controls can work with validation controls. Before using the control, check if it has a ValidationPropertyAttribute. The following controls can be used with validation controls:
All validation controls have a set of common properties defined by the ancestor class BaseValidator. These properties are listed overleaf.
ControlToValidate Specifies the ID of the input ...