Method of converting Partial View to string in controller in ASP.

namespacecommon.helper{ Public Static classcontrollerextension {//converts part of a view's content to a string based on part of the view name         Public Static stringRenderpartialviewtostring ( ThisController controller,stringpartialviewname) {            returnController. Renderpartialviewtostring (Partialviewname,NULL); }        //converts part of a view's content to a string based on part of the view name and model         Public Static stringRenderpartialviewtostring ( ThisController controller,stringPartialviewname,Objectmodel) {            //if Partialviewname is empty, the action name is used as part of the view name            if(string. IsNullOrEmpty (Partialviewname)) {Partialviewname= Controller. ControllerContext.RouteData.GetRequiredString ("Action"); }            //Put the model into the Controller.ViewData.Model attributeController. Viewdata.model =model; using(varSW =NewStringWriter ()) {                //From the view engine, in the current ControllerContext, get the Viewengineresult type based on the partial view name                varViewResult =ViewEngines.Engines.FindPartialView (Controller.                ControllerContext, Partialviewname); //Create ViewContext                varViewContext =NewViewContext (Controller. ControllerContext, Viewresult.view, controller. ViewData, Controller.                TempData, SW); //write the contents into the StringWriterViewResult.View.Render (ViewContext, SW); //stringwriter→string                returnSW. Getstringbuilder ().            ToString (); }        }    }}