What are the validation controls and how many validation controls are there in ASP.NET 4.0?
Validation controls allows you to validate a control against a
set of rules. There are 6 different validation controls used in
ASP.NET 2.0. RequiredFieldValidator - Checks if the control is not
empty when the form is submitted. CompareValidator - Compares the
value of one control to another using a comparison operator (equal,
less than, greater than etc). RangeValidator - Checks whether a
value falls within a given range of number, date or string.
RegularExpressionValidator - Confirms that the value of a control
matches a pattern defined by a regular expression. Eg: Email
validation. CustomValidator - Calls your own custom validation
logic to perform validations that cannot be handled by the built in
validators. ValidationSummary - Show a summary of errors raised by
each control on the page on a specific spot or in a message
box.