How do I pass a controller into renderrazorviewtostring

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C#

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ASP.NET-Core

I do not know how to insert the controller I want to use. I followed this video to make a modal with validation:
jQuery Ajax CRUD in ASP.NET Core MVC using Popup Dialog - YouTube[^]
When the validation is good, I need it to bring the user to the Album controller. Currently, it is set to use the Song controller by using the this keyword:

return Json(new { isValid = true, html = Helper.RenderRazorViewToString(this, "Index", context.Songs.ToList()) });

public IActionResult AddOrEdit(Song song)
        {
            if (ModelState.IsValid)
            {
                <-- removed for brevity -->
                    
                }
                context.SaveChanges();
                return Json(new { isValid = true, html = Helper.RenderRazorViewToString(AlbumController, "Index", context.Songs.ToList()) });
            }

The Helper class

public class Helper
    {
        public static string RenderRazorViewToString(Controller controller, string viewName, object model = null)
        {
            controller.ViewData.Model = model;
            using (var sw = new StringWriter())
            {
                IViewEngine viewEngine = controller.HttpContext.RequestServices.GetService(typeof(ICompositeViewEngine)) as ICompositeViewEngine;
                ViewEngineResult viewResult = viewEngine.FindView(controller.ControllerContext, viewName, false);

                ViewContext viewContext = new ViewContext(
                    controller.ControllerContext,
                    viewResult.View,
                    controller.ViewData,
                    controller.TempData,
                    sw,
                    new HtmlHelperOptions()
                );
                viewResult.View.RenderAsync(viewContext);
                return sw.GetStringBuilder().ToString();
            }
        }
    }

What I have tried:

Passing in the controller as a string:

return Json(new { isValid = true, html = Helper.RenderRazorViewToString("Album", "Index", context.Songs.ToList()) });