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5 Types of validation control exists: • RequiredFieldValidator:To enforce a user to fill a particular field before submitting the form. This is done when the field is a mandatory input .e.g.: username & password • RangeValidator:To validate if the user input fits within a range of lower and upper limits. • CompareValidator:This is to compare the user input against other existing value. • RegularExpressionValidator:This is to ensure that the use input is as per the expected pattern. e.g.: Phone number, emails • CustomValidator:Custom validator allows developers to create their own validators based on their logics. This could be a mix of other validators.