ASP.NET Validation Controls

Below are types of asp.net validation controls:
1. Required FieldValidator
    Ensures user does not left control without data.
Reference:  How to: Validate Required Entries for ASP.NET Server Controls.

2. RangeValidator
   Check if entered values are in between given upper and lower boundries.
Reference:   How to: Validate Against a Range of Values for ASP.NET Server Controls.

3. RegularExpressionValidator
   Checks that entered data matches to the given pattern of Regular Expression.
Reference:  How to: Validate Against Patterns for ASP.NET Server Controls.

4. CompareValidator
    Compares the values entered by user with other control or constant value or
Reference: How to: Validate Against a Specific Value for ASP.NET Server Controls and How to: Validate Against a Data Type for ASP.NET Server Controls.

5. Custom Validator
   Check the entered values agains the logic you write yourself for validation.
Reference: How to: Validate with a Custom Function for ASP.NET Server Controls and How to: Validate Against Values in a Database for ASP.NET Server Controls.

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