add 1.2.4 lock construct in CSharp project

ADIS_Csharp/ConsoleApp/Program.cs

@@ -132,7 +132,7 @@ class ThreadStop2
 #endif
 
 
-#if true
+#if false
 class SimpleBlocking
 {
 
@@ -168,3 +168,37 @@ class SimpleBlocking
 }
 
 #endif
+
+#if true
+
+class LockingConstruct1 {
+    private static object locker = new object();
+
+    static void Main()
+    {
+        long sum = 0;
+
+        Thread t1 = new Thread(delegate()
+        {
+            lock (locker)
+            {
+                for (int i = 0; i <= 1000; i++) {
+                    sum += i;
+                }
+            }
+        });
+
+        Thread t2 = new Thread(delegate()
+        {
+            lock (locker)
+            {
+                Console.WriteLine("Summe = " + sum);
+            }
+        });
+
+        t1.Start();
+        t2.Start();
+    }
+}
+
+#endif