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The following validation controls are supported in ASP.NET AJAX 4.0: • FilteredTextBoxExtender : This validation is used to apply filtering to a text box. • MaskedEditExtender and MaskedEditValidator : These validation controls are used to prevent a user to enter only a particular pattern of characters in the TextBox. • ValidatorCalloutExtender : This validation is used to display a balloon tooltip containing the error message by attaching the ASP.NET validators. • NoBot : It restricts the input forms automatically to be filled by spam/bot and used to ensure that the user is not a computer machine by the automated Public Turing test. • PasswordStrengthExtender : It is used to find the strength of the password entered in the text box by checking the different strength related parameters.