add missing Do extension

csharp/Lib/Utils/Utils.cs

@@ -31,7 +31,13 @@ public static class Utils
         return (T) Convert.ChangeType(c, type);
     }
 
-
+    public static T Do<T>(this T t, Action action)
+    {
+        action();
+        return t;
+    }
+    
+    
     [DebuggerStepThrough][MethodImpl(AggressiveInlining | AggressiveOptimization)]
     public static void Nop<T>(T _) {}