Hello Bhasker Agarwal,
Thank you for writing.
has no built-in feature for validating user input. However, you could take a look at the following forum post, where you will find a detailed explanation and workaround you could use: http://www.telerik.com/community/forums/thread/b311D-bbchhc.aspx
As to your second question, I have provided the answer in your other post.
If you have additional questions, please contact us again.
All the best,
the Telerik team