That is not a problem at all. From your business assembly, add a reference to the 3rd party controls that you have. Do your data binding and such as one would do for a standard control. For example, you add reference to the assembly that contains the 3rd party controls (tell me if you have VS.NET or compiling via the command line). Once you have done that, you import the namespace(s) of where the 3rd party control(s) exist. Once you have done that, you may begin as you would have done to a normal server control.