Index: src/Common/NetTopologySuite/Algorithm/CentroidArea.cs
===================================================================
diff -u -r8f6ae890fed8e8eae3a32f9c0498a10f82e0ddf9 -r5fc71a385897af92ccb092f2f969b5709afab85a
--- src/Common/NetTopologySuite/Algorithm/CentroidArea.cs	(.../CentroidArea.cs)	(revision 8f6ae890fed8e8eae3a32f9c0498a10f82e0ddf9)
+++ src/Common/NetTopologySuite/Algorithm/CentroidArea.cs	(.../CentroidArea.cs)	(revision 5fc71a385897af92ccb092f2f969b5709afab85a)
@@ -15,34 +15,50 @@
     /// </summary>
     public class CentroidArea
     {
-        private ICoordinate basePt = null;                       // the point all triangles are based at
-        private ICoordinate triangleCent3 = new Coordinate();    // temporary variable to hold centroid of triangle
-        private double areasum2 = 0;                            // Partial area sum
-        private ICoordinate cg3 = new Coordinate();              // partial centroid sum
+        private ICoordinate basePt = null; // the point all triangles are based at
+        private ICoordinate triangleCent3 = new Coordinate(); // temporary variable to hold centroid of triangle
+        private double areasum2 = 0; // Partial area sum
+        private readonly ICoordinate cg3 = new Coordinate(); // partial centroid sum
 
         /// <summary>
         /// 
         /// </summary>
-        public CentroidArea() { }
+        public CentroidArea() {}
 
+        /// <summary>
+        /// 
+        /// </summary>
+        public ICoordinate Centroid
+        {
+            get
+            {
+                ICoordinate cent = new Coordinate();
+                cent.X = cg3.X/3/areasum2;
+                cent.Y = cg3.Y/3/areasum2;
+                return cent;
+            }
+        }
+
         /// <summary> 
         /// Adds the area defined by a Geometry to the centroid total.
         /// If the point has no area it does not contribute to the centroid.
         /// </summary>
         /// <param name="geom">The point to add.</param>
         public void Add(IGeometry geom)
         {
-            if (geom is IPolygon) 
+            if (geom is IPolygon)
             {
                 IPolygon poly = (IPolygon) geom;
                 BasePoint = poly.ExteriorRing.GetCoordinateN(0);
                 Add(poly);
             }
-            else if (geom is IGeometryCollection) 
+            else if (geom is IGeometryCollection)
             {
                 IGeometryCollection gc = (IGeometryCollection) geom;
                 foreach (IGeometry geometry in gc.Geometries)
+                {
                     Add(geometry);
+                }
             }
         }
 
@@ -61,30 +77,18 @@
         /// <summary>
         /// 
         /// </summary>
-        public ICoordinate Centroid
-        {
-            get
-            {
-                ICoordinate cent = new Coordinate();
-                cent.X = cg3.X / 3 / areasum2;
-                cent.Y = cg3.Y / 3 / areasum2;
-                return cent;
-            }
-        }
-        
-        /// <summary>
-        /// 
-        /// </summary>
         private ICoordinate BasePoint
         {
             get
             {
-                return this.basePt;
+                return basePt;
             }
             set
             {
-                if (this.basePt == null)
-                    this.basePt = value;
+                if (basePt == null)
+                {
+                    basePt = value;
+                }
             }
         }
 
@@ -96,7 +100,9 @@
         {
             AddShell(poly.ExteriorRing.Coordinates);
             foreach (ILineString ls in poly.InteriorRings)
+            {
                 AddHole(ls.Coordinates);
+            }
         }
 
         /// <summary>
@@ -107,7 +113,9 @@
         {
             bool isPositiveArea = !CGAlgorithms.IsCCW(pts);
             for (int i = 0; i < pts.Length - 1; i++)
+            {
                 AddTriangle(basePt, pts[i], pts[i + 1], isPositiveArea);
+            }
         }
 
         /// <summary>
@@ -118,7 +126,9 @@
         {
             bool isPositiveArea = CGAlgorithms.IsCCW(pts);
             for (int i = 0; i < pts.Length - 1; i++)
+            {
                 AddTriangle(basePt, pts[i], pts[i + 1], isPositiveArea);
+            }
         }
 
         /// <summary>
@@ -133,9 +143,9 @@
             double sign = (isPositiveArea) ? 1.0 : -1.0;
             Centroid3(p0, p1, p2, ref triangleCent3);
             double area2 = Area2(p0, p1, p2);
-            cg3.X += sign * area2 * triangleCent3.X;
-            cg3.Y += sign * area2 * triangleCent3.Y;
-            areasum2 += sign * area2;
+            cg3.X += sign*area2*triangleCent3.X;
+            cg3.Y += sign*area2*triangleCent3.Y;
+            areasum2 += sign*area2;
         }
 
         /// <summary> 
@@ -156,7 +166,7 @@
         /// </summary>
         private static double Area2(ICoordinate p1, ICoordinate p2, ICoordinate p3)
         {
-            return (p2.X - p1.X) * (p3.Y - p1.Y) - (p3.X - p1.X) * (p2.Y - p1.Y);
+            return (p2.X - p1.X)*(p3.Y - p1.Y) - (p3.X - p1.X)*(p2.Y - p1.Y);
         }
     }
-}
+}
\ No newline at end of file