I can't able how to call controller from external assembly C# MVC 4?

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MVC4

Kendo

call controller in external assembly from partial view page through read action method in kendo. How to resolve

.DataSource(src => src.Read(read => read.Action("Index", "EIPComboboxComplete").Data("onAdditional")).ServerFiltering(false))

What I have tried:

Class Library:

public partial class EIPComboboxCompleteController : Controller
{
//public virtual JsonResult Read(JsonResult Parameters)
//{
// return Json(Parameters);
//}
public ActionResult Index()
{
return View();
}
}