diff --git a/Source/DotSpatial.Data/Argb.cs b/Source/DotSpatial.Data/Argb.cs
index a7d720bd0..32dcd0079 100644
--- a/Source/DotSpatial.Data/Argb.cs
+++ b/Source/DotSpatial.Data/Argb.cs
@@ -3,7 +3,7 @@
 namespace DotSpatial.Data
 {
     /// <summary>
-    /// Tiny structure for storing A,R,G,B components of Color
+    /// Tiny structure for storing A,R,G,B components of Color.
     /// </summary>
     public struct Argb
     {
@@ -16,12 +16,26 @@ public struct Argb
 
         #endregion
 
+        /// <summary>
+        /// Creates a new Argb object from the given values. If the values are bigger than 255 they are changed to 255. If the values are smaller than 0 they are changed to 0.
+        /// </summary>
+        /// <param name="a">The a part of a color.</param>
+        /// <param name="r">The r part of a color.</param>
+        /// <param name="g">The g part of a color.</param>
+        /// <param name="b">The b part of a color.</param>
         public Argb(int a, int r, int g, int b)
             : this(ByteRange(a), ByteRange(r), ByteRange(g), ByteRange(b))
         {
             
         }
 
+        /// <summary>
+        /// Creates a new Argb object from the given values.
+        /// </summary>
+        /// <param name="a">The a part of a color.</param>
+        /// <param name="r">The r part of a color.</param>
+        /// <param name="g">The g part of a color.</param>
+        /// <param name="b">The b part of a color.</param>
         public Argb(byte a, byte r, byte g, byte b)
         {
             _a = a;
@@ -30,32 +44,44 @@ public Argb(byte a, byte r, byte g, byte b)
             _b = b;
         }
 
+        /// <summary>
+        /// The A part of this Argb object.
+        /// </summary>
         public byte A
         {
             get { return _a; }
         }
 
+        /// <summary>
+        /// The B part of this Argb object.
+        /// </summary>
         public byte B
         {
             get { return _b; }
         }
 
+        /// <summary>
+        /// The G part of this Argb object.
+        /// </summary>
         public byte G
         {
             get { return _g; }
         }
 
+        /// <summary>
+        /// The R part of this Argb object.
+        /// </summary>
         public byte R
         {
             get { return _r; }
         }
 
         /// <summary>
-        /// Returns an integer that ranges from 0 to 255.  If value is larger than 255, the value will be equal to 255.
-        /// If the value is smaller than 255, it will be equal to 255.
+        /// Returns an byte that corresponds to the given value. If value is larger than 255, the value will be equal to 255.
+        /// If the value is smaller than 0, it will be equal to 0.
         /// </summary>
-        /// <param name="value">A Double value to convert.</param>
-        /// <returns>An integer ranging from 0 to 255</returns>
+        /// <param name="value">An integer value to convert.</param>
+        /// <returns>A byte that corresponds to the integer ranging from 0 to 255.</returns>
         public static byte ByteRange(int value)
         {
             if (value > 255) return 255;
@@ -63,11 +89,20 @@ public static byte ByteRange(int value)
             return (byte)value;
         }
 
+        /// <summary>
+        /// Converts this Argb to Color.
+        /// </summary>
+        /// <returns>Color build from the Argb values.</returns>
         public Color ToColor()
         {
             return Color.FromArgb(A, R, G, B);
         }
 
+        /// <summary>
+        /// Converts the given Color to Argb.
+        /// </summary>
+        /// <param name="color">color that gets converted.</param>
+        /// <returns>Argb object that contains the color values.</returns>
         public static Argb FromColor(Color color)
         {
             return new Argb(color.A, color.R, color.G, color.B);
diff --git a/Source/DotSpatial.NTSExtension/EnvelopeExt.cs b/Source/DotSpatial.NTSExtension/EnvelopeExt.cs
index 8c4d5907a..b0d9c3526 100644
--- a/Source/DotSpatial.NTSExtension/EnvelopeExt.cs
+++ b/Source/DotSpatial.NTSExtension/EnvelopeExt.cs
@@ -4,8 +4,17 @@
 
 namespace DotSpatial.NTSExtension
 {
+    /// <summary>
+    /// This contains extension methods for GeoApi.Geometries.Envelope.
+    /// </summary>
     public static class EnvelopeExt
     {
+        /// <summary>
+        /// Initializes the envelopes Minimum.Z with the smaller of the two given z values and the Maximum.Z with the bigger of the two given z values. 
+        /// </summary>
+        /// <param name="envelope">Envelope, whos Minimum and Maximum.Z should be initialized.</param>
+        /// <param name="z1">First z value.</param>
+        /// <param name="z2">Second z value.</param>
         public static void InitZ(this Envelope envelope, double z1, double z2)
         {
             if (z1 < z2)
@@ -20,6 +29,12 @@ public static void InitZ(this Envelope envelope, double z1, double z2)
             }
         }
 
+        /// <summary>
+        /// Initializes the envelopes Minimum.M with the smaller of the two given m values and the Maximum.M with the bigger of the two given m values. 
+        /// </summary>
+        /// <param name="envelope">Envelope, whos Minimum and Maximum.M should be initialized.</param>
+        /// <param name="m1">First m value.</param>
+        /// <param name="m2">Second m value.</param>
         public static void InitM(this Envelope envelope, double m1, double m2)
         {
             if (m1 < m2)
@@ -34,6 +49,11 @@ public static void InitM(this Envelope envelope, double m1, double m2)
             }
         }
 
+        /// <summary>
+        /// Checks whether the given Envelope has M values.
+        /// </summary>
+        /// <param name="envelope">Envelope that gets checked.</param>
+        /// <returns>False if either envelope.Minimum.M or envelope.Maximum.M is not a number or Minimum.M is bigger than Maximum.M. </returns>
         public static bool HasM(this Envelope envelope)
         {
             if (double.IsNaN(envelope.Minimum.M) || double.IsNaN(envelope.Maximum.M))
@@ -41,6 +61,11 @@ public static bool HasM(this Envelope envelope)
             return envelope.Minimum.M <= envelope.Maximum.M;
         }
 
+        /// <summary>
+        /// Checks whether the given Envelope has Z values.
+        /// </summary>
+        /// <param name="envelope">Envelope that gets checked.</param>
+        /// <returns>False if either envelope.Minimum.Z or envelope.Maximum.Z is not a number or Minimum.Z is bigger than Maximum.Z. </returns>
         public static bool HasZ(this Envelope envelope)
         {
             if (double.IsNaN(envelope.Minimum.Z) || double.IsNaN(envelope.Maximum.Z))
diff --git a/Source/DotSpatial.NTSExtension/GeometryExt.cs b/Source/DotSpatial.NTSExtension/GeometryExt.cs
index 37cc86044..abc0fe353 100644
--- a/Source/DotSpatial.NTSExtension/GeometryExt.cs
+++ b/Source/DotSpatial.NTSExtension/GeometryExt.cs
@@ -3,6 +3,9 @@
 
 namespace DotSpatial.NTSExtension
 {
+    /// <summary>
+    /// Contains extension methods for GeoAPI.Geometries.IGeometry.
+    /// </summary>
     public static class GeometryExt
     {
 
@@ -50,6 +53,7 @@ public static void Rotate(this IGeometry self, Coordinate origin, double radAngl
                     break;
             }
         }
+      
         /// <summary>
         /// Rotates the given coordinate by the given radian angle around the origin.
         /// </summary>
diff --git a/Source/DotSpatial.NTSExtension/LineStringExt.cs b/Source/DotSpatial.NTSExtension/LineStringExt.cs
index 38042c6da..7993f5508 100644
--- a/Source/DotSpatial.NTSExtension/LineStringExt.cs
+++ b/Source/DotSpatial.NTSExtension/LineStringExt.cs
@@ -4,12 +4,16 @@
 
 namespace DotSpatial.NTSExtension
 {
+    /// <summary>
+    /// Contains extension methodes for GeoAPI.Geomtetries.ILineString.
+    /// </summary>
     public static class LineStringExt
     {
 
         /// <summary>
         /// Gets the value of the angle between the StartPoint and the EndPoint in Radian.
-        /// </summary>
+        /// </summary>
+        /// <param name="self">The ILineString, whose angle is returned.</param>
         /// <remarks>added by JLeiss</remarks>
         public static double RadAngle(this ILineString self)
         {
@@ -28,7 +32,8 @@ public static double RadAngle(this ILineString self)
         /// <summary>
         /// Given the specified test point, this checks each segment, and will
         /// return the closest point on the specified segment.
-        /// </summary>
+        /// </summary>
+        /// <param name="self">The ILineString, whose point is returned.</param>
         /// <param name="testPoint">The point to test.</param>
         public static Coordinate ClosestPoint(this ILineString self, Coordinate testPoint)
         {