1.RequiredFieldValidator - Helps in ensuring that a value has been entered for a field.
2.CompareValidator - Checks if the value of a control matches the value of another controls or variable.
3.RangeValidator - Checks if the value entered in a control is in specified range of values.
4.RegularExpressionValidator - Checks if the value entered matches the regular expression that specified.
5.CustomValidator - The value entered is checked by a client-side or server side function created by us.
6.ValidationSummary - A List of all validation errors occurring in all the controls is created and can be displayed on the page.
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