Finished Creating an Extension Method

Features/MyLinq.cs

@@ -0,0 +1,20 @@
+using System.Collections.Generic;
+
+namespace Features
+{
+    public static class MyLinq
+    {
+        // Implement a customized LINQ using extension  
+        public static int MyLinqCount<T>(this IEnumerable<T> sequence)
+        {
+            // Any IEnumerable<T> instance can use this method now as extension 
+            int count = 0;
+            foreach (var item in sequence)
+            {
+                count += 1;
+            }
+
+            return count;
+        }
+    }
+}

Features/Program.cs

@@ -20,6 +20,8 @@ namespace Features
                 new Employee {Id = 3, Name = "Alex"}
             };
             
+            Console.WriteLine(sales.MyLinqCount());
+
             var enumerator = developers.GetEnumerator();
 
             while (enumerator.MoveNext())