Call a method that returns html from an action method

public ActionResult MyActionMethod(MyModel model)
{
    //some code
    string myVar= ActionMethod2(model).toString();
    //use myVar
    Method3(myVar, otherVar);
}

public ActionResult ActionMethod2()(MyModel model)
{
    return View(model);
}

private  Method3(string myVar,  int otherVar)
{
    //do something;
}

As sample code, above, I have a method that returns .cshtml view, called ActionMethod2.
I want to use the returned html as a string variable in my action method.How is that possible?

First Mistake is ActionMethod2 return View, And you can get it directly from MyActionMethod

protected string RenderPartialViewToString(string viewName, object model)
    {
        if (string.IsNullOrEmpty(viewName))
            viewName = ControllerContext.RouteData.GetRequiredString("action");

        ViewData.Model = model;

        using (var sw = new StringWriter())
        {
            ViewEngineResult viewResult = ViewEngines.Engines.FindPartialView(ControllerContext, viewName);
            var viewContext = new ViewContext(ControllerContext, viewResult.View, ViewData, TempData, sw);
            viewResult.View.Render(viewContext, sw);

            return sw.GetStringBuilder().ToString();
        }
    }


public ActionResult MyActionMethod(MyModel model)
{
     //some code
     //string myVar= ActionMethod2(model).toString();
     var myVar = RenderPartialViewToString("yourviewName", model);
     //use myVar
     Method3(myVar, otherVar);
}

try this and it will work with you.