diff --git a/src/cs/piki/linq.cs b/src/cs/piki/linq.cs
new file mode 100644
index 0000000..43a322f
--- /dev/null
+++ b/src/cs/piki/linq.cs
@@ -0,0 +1,7 @@
+using System;
+using System.Linq;
+using MoreLinq;
+
+
+var result = String.Concat("AAABBAACC".GroupAdjacent(c => c, (c, cc) => "" + cc.Count() + c));
+Console.WriteLine(result);