Render razorviews as strings.

gistfile1.cs

using (var sw = new StringWriter()) {
    ViewEngineResult viewEngineResult = ViewEngines.Engines.FindPartialView(controllerContext, viewName);
    var viewContext = new ViewContext(controllerContext, viewEngineResult.View, viewData, new TempDataDictionary(), sw);
    viewEngineResult.View.Render(viewContext, sw);
    return sw.GetStringBuilder().ToString();
}