In Asp.net Six Types of Validation Controls are Available.
1)Required Field validator.
2)compare validator.
3)Range field validator.
4)Regular Expression validator.
5)Custom validator.
6)Validation Summary Contril.
1)Required Field validator: It does not allow Blank values.
ex:textbox does not allow blank,
2)compare validator:You can compare the two textboxes values like
password two textboxes.
3)Range field validator:It can be Allowed with in Particular range of values like a age you can allowed with in 20 to 90 years.
4)Regular Expression validator:It can be used for the email address,Phone no like that .
5)Custom validator:it can be used for the custom validations dependce on requirements.
6)Validation Summary Contril:It can be Display the All errors at one place.
Thanks,
Narasima

Dear
There are six type of validation controls available in Asp.Net. These are :
a. RequiredFieldValidator
b. CompareValidator
c. RangeValidator
d. RegularExpressionValidator
e. CustomValidator
f. ValidationSummary

In ASP.Net. there are six types of Validator controls available :
RequiredFieldValidator
RangeValidator
RegularExpressionValidator
CompareValidator
CustomValidator
Validation Summary