what are the Validation Controls ? How many Types of Validation Controls

 Validation Controls:
                                         Web pages need validations both server side and client side.We can validate at server side using C# and also at client side using JavaScript.So many validations in web application are common like checking for nulls, checking for range of values and others. Writing JavaScript for these validations is complex and time consuming. Writing Asp.Net code is easy but Little time consuming.  
                                      These are Six Validation controls also available and .

1. RequiredField Validator
2. Compare Validator
3. Range Validator
4. Custom Validator
5. RegularExpression Validator
6. Validation summary control