I am not sure how this question related to RadSlider. Such UI can be created by using RadRotator instead—http://demos.telerik.com/aspnet-ajax/rotator/examples/data-binding/server-side-binding/data-sources/defaultcs.aspx
The demo provided shows how to data bind resources from database, although, using mySQL is a matter that should be manually handled in the ASP.NET project and it is not a relevant part for using Telerik controls.
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