Hi Ibrahim Imam,
Thank you for your feedback.
You need to recreate all RadSliders in each postback. Therefore, you should override the OnInit
method and put there the desired functionality. I attached a sample application demonstrating how to realize this saving RadSliders in the session. You can view it by yourself in the Default1 page.
There is a better way to have the same functionality if you save RadSliders in the viewstate. Use the Default2 page to see how you can do this.
If something is unclear or you have any other questions, do not hesitate to contact us again.
All the best,
the Telerik team