public class ViewManager<T> where T : System.Web.UI.UserControl

    {

        private System.Web.UI.Page m_pageHolder;

        public T LoadViewControl(string path)

        {

            this.m_pageHolder = new System.Web.UI.Page();

            return (T)this.m_pageHolder.LoadControl(path);

        }

        public string RenderView(T control)

        {

            StringWriter output = new StringWriter();

            this.m_pageHolder.Controls.Add(control);

            HttpContext.Current.Server.Execute(this.m_pageHolder, output, false);

            return output.ToString();

        }

    }

Control control = viewManager.LoadViewControl("~/Controls/" + name);

context.Response.Write(viewManager.RenderView(control));