Hi Sivakumar,
Thank you for posting in the community.
I could not understand exactly what you are trying to achieve. But in case you want to have some initial value set for the WebDropDown, you could use the CurrentValue property. However, please notice that v8.1 is outdated and not supported, so I would suggest you to upgrade your product.
Feel free to contact me if you have any further questions.
Hello Sivakumar,
I'm following up to see if you have resolved your issue.