When the values of two controls have to be compared or the value of a control has to be compared to a specified constant value, the CompareValidator control is used.
| Example1: | |
| Suppose that you want your user to be atleast 18 years old to join your website, then you have to check the age entered by the user to see whether he/she is 18 years old or not. This could be done very easily by using CompareValidator control. You just need to set the following CompareValidator properties: |
| ID | Age_Validator |
| ControlToValidate | Age |
| ErrorMessage | Age should be 18 or more |
| Operator | GreaterThanEqual |
| Type | Integer |
| ValueToCompare | 18 |
Demo:
| Example2: | |
| If you do not want your user to be more than 60 years old, then CompareValidator properties would be: |
| ID | Age_Validator |
| ControlToValidate | Age |
| ErrorMessage | Age cannot be greater than 60 |
| Operator | LessThanEqual |
| Type | Integer |
| ValueToCompare | 60 |
Demo:
CompareValidator is also used to compare two passwords.CompareValidator properties to compare passwords are:
| ID | Password_Validator |
| ControlToCompare | Password |
| ControlToValidate | Confirm_Password |
| ErrorMessage | The two passwords do not match |
| Operator | Equal |
| Type | String |
Demo:
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