Validation Controls in Asp.Net

ASP.NET validation controls validate data first on the client and then on the web server. If a client disables JavaScript on the browser then, client side validations are bypassed and validations are performed on the web server.

Validation controls also automatically provide server-side validation. Server-side validation is always performed, whether or not client-side validation has occurred. This double-checking ensures that custom validations are performed correctly and that client-side validation has not been circumvented.

Validation Controls in Asp.Net

• RequiredfieldValidator
  
• CompareValidator
  
• CustomValidator
  
• RegularExpressionValidator
  
• ValidationSummary
  
• RangeValidator

RequiredfieldValidator:

                Checks whether a control contains data

 CompareValidator:

Checks whether an entered item matches an entry in another control

RangeValidator:

Checks whether an entered item is between two values

RegularExpressionValidator:

Checks whether an entered item matches a specified format

CustomValidator:

Checks the validity of an entered item using a client-side script or a server-side code, or both

ValidationSummary:

Displays validation errors in a central location or display a general validation error description