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Define the steps to set up validation control.

Following are the steps to set up validation control

Drag a validation control on a web form.
Set the ControlToValidate property to the control to be validated.
If you are using CompareValidator, you have to specify the ControlToCompare property.
Specify the error message you want to display using ErrorMessage property.
You can use ValidationSummary control to show errors at one place.