I am using Telerik.web.UI.dll of version 2017.1.118.35 and Telerik.web.design.dll of version 2017.1.118.45
I am adding the references of the two dlls to the project.
The target framework I am using is 4.0.
In the Souce mode I am facing the issue "Unrecognized Tagprefix or device filter Telerik" and " Error Creating Control" in Design mode.
Please let me know if there is a version problem of the two dlls and Target Framework