Answer / ramgopal reddy

Client-side. This reduces an additional request to the
server to validate the users input.

Answer / fusion

Ramgopal is correct upto certain extent.
What if User has his Javascript disabled on browser?
Range Validator could do well there.

Answer / sulochana singh

Client-side validation because there is no need to request a server side date when you could obtain a date from the client machine.

Answer / surendra singh

It should occur both at client-side and Server side.By using expression validator control with the specified expression ie.. the regular expression provides the facility of only validatating the date specified is in the correct format or not. But for checking the date where it is the real data or not should be done at the server side, by getting the system date ranges and checking the date whether it is in between that range or not.

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