Any way you can pass a model in BackendURL

The backend URL is just a URL string and it doesn't allow passing anything else.

You can pass custom parameters as an ID, query string or in a cookie.

Example for custom query string:

@Url.Action("Backend", "Controller", new { user = "John", type = "2" })

You can read the query string anywhere in the backend class using Controller.Request.QueryString:

public class Dps: DayPilotScheduler {
  protected override void OnInit(InitArgs ea)
  {
    string name = Controller.Request.QueryString["name"];
    // ...
  }
}

Thanks Dan