Hi cipriyan,

It has been some time since your post, however in case you still need assistance I would be glad to help.

I am assuming that you are referring to the WebDataGrid control. I suggest that you take a look at the following article on the subject of validating the values in your row edit template client side:

http://blogs.infragistics.com/forums/p/54566/282195.aspx

Server-side validation may be performed by handling the RowUpdating(ed) event which would allow you to examine the new cell values.

Please feel free to contact me if you have any questions.