Use c#9 + namespace fix

src/Umbraco.Web.UI.NetCore/BergViewComponent.cs

@@ -0,0 +1,23 @@
+using Microsoft.AspNetCore.Mvc;
+using Umbraco.Cms.Core.Web;
+
+namespace Umbraco.Cms.Web.UI.NetCore
+{
+    public class BergViewComponent : ViewComponent
+    {
+        private readonly IUmbracoContextAccessor _umbracoContextAccessor;
+
+        public BergViewComponent(IUmbracoContextAccessor umbracoContextAccessor)
+        {
+            _umbracoContextAccessor = umbracoContextAccessor;
+        }
+
+        public IViewComponentResult Invoke()
+        {
+            TempData["BERG"] = "coool";
+
+            var currentPage = _umbracoContextAccessor.UmbracoContext.PublishedRequest?.PublishedContent;
+            return View(currentPage);
+        }
+    }
+}