Add backload for multiple file upload

Web/Backload/Controller/BackloadController.obsolete.cs

@@ -0,0 +1,26 @@
+using System;
+using System.Threading.Tasks;
+using System.Web.Mvc;
+
+namespace Backload.Controllers
+{
+
+    /// <summary>
+    /// The integrated controller to handle file requests. 
+    /// You can remove this code, if you have a custom controller or a derived controller.
+    /// </summary>
+    public partial class BackloadController : Controller
+    {
+        /// <summary>
+        /// This handler is for backward compatibility only. If you have a previous project updated to 
+        /// Backload release 2 or higher, please also update your calls in JavaScript to the new handler url
+        /// /Backload/Filehandler. After that you can remove this handler.
+        /// </summary>
+        [Obsolete("This handler is form backward compatibility only.")]
+        [AcceptVerbs(HttpVerbs.Get | HttpVerbs.Post | HttpVerbs.Put | HttpVerbs.Delete | HttpVerbs.Options)]
+        public async Task<ActionResult> UploadHandler()
+        {
+            return await FileHandler();
+        }
+    }
+}