Index: DamEngine/trunk/src/Deltares.DamEngine.Data/Geometry/GeometryPointString.cs
===================================================================
diff -u -r5200 -r5209
--- DamEngine/trunk/src/Deltares.DamEngine.Data/Geometry/GeometryPointString.cs	(.../GeometryPointString.cs)	(revision 5200)
+++ DamEngine/trunk/src/Deltares.DamEngine.Data/Geometry/GeometryPointString.cs	(.../GeometryPointString.cs)	(revision 5209)
@@ -872,21 +872,24 @@
         return x;
     }
     
-    private static IEnumerable<GeometryPoint> GetLoopSegmentMiddlePoints(GeometryLoop geometryLoop)
+    private static IEnumerable<GeometryPoint> GetLoopSegmentMiddlePoints(GeometryPointString geometryLoop)
     {
-        List<GeometryPoint> loopSegmentMiddlePoints = new List<GeometryPoint>();
-        int index = 0;
+        var loopSegmentMiddlePoints = new List<GeometryPoint>();
+        var index = 0;
         while (index < checked (geometryLoop.Points.Count - 1))
         {
-            GeometryPointString.AddLoopSegmentMiddlePoint(geometryLoop.Points[index], geometryLoop.Points[checked (index + 1)], loopSegmentMiddlePoints);
+            AddLoopSegmentMiddlePoint(geometryLoop.Points[index], geometryLoop.Points[checked (index + 1)], loopSegmentMiddlePoints);
             checked { ++index; }
         }
         if (geometryLoop.Points.Count > 2)
-            GeometryPointString.AddLoopSegmentMiddlePoint(geometryLoop.Points[0], geometryLoop.Points.Last<GeometryPoint>(), loopSegmentMiddlePoints);
-        return (IEnumerable<GeometryPoint>) loopSegmentMiddlePoints;
+        {
+            int last = geometryLoop.Points.Count - 1;
+            AddLoopSegmentMiddlePoint(geometryLoop.Points[0], geometryLoop.Points[last], loopSegmentMiddlePoints);
+        }
+        return loopSegmentMiddlePoints;
     }
     
-    private static void AddLoopSegmentMiddlePoint(GeometryPoint point1, GeometryPoint point2, List<GeometryPoint> loopSegmentMiddlePoints)
+    private static void AddLoopSegmentMiddlePoint(GeometryPoint point1, GeometryPoint point2, IList<GeometryPoint> loopSegmentMiddlePoints)
     {
         if (Math.Abs(point1.Z - point2.Z) < 0.001)
             loopSegmentMiddlePoints.Insert(0, new GeometryPoint((point1.X + point2.X) / 2.0, point1.Z));