Minor changes and additions.

src/Triangle.Examples/Examples/Example4.cs

@@ -8,7 +8,7 @@ namespace TriangleNet.Examples
     using TriangleNet.Smoothing;
 
     /// <summary>
-    /// Refine only a part of a polygon mesh be using region pointers and an area constraint.
+    /// Refine only a part of a polygon mesh by using region pointers and an area constraint.
     /// </summary>
     public class Example4
     {

src/Triangle.Examples/Examples/Example7.cs

@@ -1,8 +1,10 @@
 
 namespace TriangleNet.Examples
 {
+    using System;
     using TriangleNet.Geometry;
     using TriangleNet.Meshing;
+    using TriangleNet.Meshing.Iterators;
     using TriangleNet.Rendering.Text;
 
     /// <summary>
@@ -26,7 +28,18 @@ namespace TriangleNet.Examples
             };
 
             // Generate mesh using the polygons Triangulate extension method.
-            var mesh = poly.Triangulate(quality);
+            var mesh = (Mesh)poly.Triangulate(quality);
+
+            // Validate.
+            foreach (var e in EdgeIterator.EnumerateEdges(mesh))
+            {
+                double length = Math.Sqrt(DistSqr(e.GetVertex(0), e.GetVertex(1)));
+
+                if (length > MAX_EDGE_LENGTH)
+                {
+                    Console.WriteLine("Something's wrong in here ...");
+                }
+            }
 
             if (print) SvgImage.Save(mesh, "example-7.svg", 500);
         }

src/Triangle.Examples/Examples/Example9.cs

@@ -11,7 +11,7 @@ namespace TriangleNet.Examples
     /// </summary>
     public class Example9
     {
-        public static void Run()
+        public static void Run(bool print = false)
         {
             var pts = new List<Vertex>
             {
@@ -39,7 +39,7 @@ namespace TriangleNet.Examples
 
                 var list = MeshValidator.GetDegenerateBoundaryTriangles(mesh);
 
-                if (list.Any())
+                if (print && list.Any())
                 {
                     Console.WriteLine("Iteration {0}: found {1} degenerate triangle(s) of {2}.",
                         i, list.Count(), mesh.Triangles.Count);