Validation Summary is a validation control which renders summary of all the validation errors on submit.
to view all control error messages at one place
1. RequiredFieldValidator - to check for mandatory field
2.RangeValidator - to check for data in the specified range
3. RegularExpressionValidator - to check for data in a particular regular expression
4. ComapreValidator - to compare two data or data types
5. CustomValidator - to attach a custom a control with the help of user defined function
6.ValidationSummary - to summarize all validation error.
to view all validation control error message.
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