WPF and Windows Forms present two different architectures for creating application interfaces. The System.Windows.Forms.Integration namespace provides classes that enable common interoperation scenarios.
The two key classes that implement interoperation capabilities are WindowsFormsHost and ElementHost. This section demonstrates how the Telerik UI for WPF controls can be integrated in a WinForms application and vice versa.
For more information, you can also refer to the following MSDN articles: