Hi Nachiappan Narayanan,
Thank you for writing. You could easily use the Tag property of the nodes. It is of type object and you will have to cast it to string but it should serve you well. The Tag property is meant to serve as storage for any kind of data that the user needs.
Do not hesitate to write again if you have more questions.
All the best,
the Telerik team
Check out Telerik Trainer
, the state of the art learning tool for Telerik products.