A Validation server control is used to validate the data of an input control. If the data does not pass validation, it will display an error message to the user.
CompareValidator : Compares the value of one input control to the value of another input control or to a fixed value [ Read.. ]
CustomValidator: Allows you to write a method to handle the validation of the value entered [ Read.. ]
RangeValidator: Checks that the user enters a value that falls between two values [ Read.. ]
RegularExpressionValidator: Ensures that the value of an input control matches a specified pattern [ Read.. ]
RequiredFieldValidator: Makes an input control a required field [ Read.. ]
Validation Server Controls in ASP.Net
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