Added TaskExtensions

Author: TalAloni

StandardSocketsHttpHandler/Threading/Tasks/Extensions/TaskExtensions.cs

@@ -0,0 +1,14 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+
+namespace System.Threading.Tasks
+{
+    internal static class TaskExtensions
+    {
+        public static bool IsCompletedSuccessfully(this Task task)
+        {
+            return task.IsCompleted && !(task.IsFaulted || task.IsCanceled);
+        }
+    }
+}