diff --git a/HelloWorld.CS b/HelloWorld.CS
new file mode 100644
index 0000000..8d50d83
--- /dev/null
+++ b/HelloWorld.CS
@@ -0,0 +1,8 @@
+using System;
+class Program
+{
+    public static void Main(string[] args)
+    {
+        Console.WriteLine("Hello world");
+    }
+}