Answer / raviraj

When it comes to client side we can validate html controls
using javascript.ont the server side you can use validation
controls such as compare validator,range validator,custom
validator,required field validator and regular expression
validator.Based on our requirement we can use one or more
above mentioned validation controls at a time in an
application

Answer / richard des jardins

Remember, Server Side Validation must always be performed,
then optionally Client Side validation to enhance the user
experience. On the server, you can write Server Side code
to perform the validation. On the Client, you can use any
of the .NET Validators or write JavaSCript and Regular
Expressions to enable validation. Both previous answers
were correct is the question was how to enable client side
validation. Always validate on the server and them
optionally on the client.

Answer / ashis

By Javascript and by using regular expression class.

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