diff --git a/S7.Net.UnitTest/Helpers/NativeMethods.cs b/S7.Net.UnitTest/Helpers/NativeMethods.cs
index 774136e..a177850 100644
--- a/S7.Net.UnitTest/Helpers/NativeMethods.cs
+++ b/S7.Net.UnitTest/Helpers/NativeMethods.cs
@@ -1,9 +1,5 @@
 using System;
-using System.Collections.Generic;
-using System.Linq;
 using System.Runtime.InteropServices;
-using System.Text;
-using System.Threading.Tasks;
 
 namespace S7.Net.UnitTest.Helpers
 {
diff --git a/S7.Net.UnitTest/Helpers/S7TestServer.cs b/S7.Net.UnitTest/Helpers/S7TestServer.cs
index 4a94142..57ed663 100644
--- a/S7.Net.UnitTest/Helpers/S7TestServer.cs
+++ b/S7.Net.UnitTest/Helpers/S7TestServer.cs
@@ -1,8 +1,4 @@
 using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 using Snap7;
 
 namespace S7.Net.UnitTest.Helpers
diff --git a/S7.Net.UnitTest/Helpers/TestClass.cs b/S7.Net.UnitTest/Helpers/TestClass.cs
index bb23785..5f1f271 100644
--- a/S7.Net.UnitTest/Helpers/TestClass.cs
+++ b/S7.Net.UnitTest/Helpers/TestClass.cs
@@ -1,9 +1,4 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
-
+
 namespace S7.Net.UnitTest.Helpers
 {
     class TestClass
diff --git a/S7.Net.UnitTest/Helpers/TestStruct.cs b/S7.Net.UnitTest/Helpers/TestStruct.cs
index 448e9ce..50455d5 100644
--- a/S7.Net.UnitTest/Helpers/TestStruct.cs
+++ b/S7.Net.UnitTest/Helpers/TestStruct.cs
@@ -1,9 +1,4 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
-
+
 namespace S7.Net.UnitTest.Helpers
 {
     public struct TestStruct
diff --git a/S7.Net.UnitTest/S7.Net.UnitTest.csproj b/S7.Net.UnitTest/S7.Net.UnitTest.csproj
index 9b825a2..202e509 100644
--- a/S7.Net.UnitTest/S7.Net.UnitTest.csproj
+++ b/S7.Net.UnitTest/S7.Net.UnitTest.csproj
@@ -8,7 +8,7 @@
     <AppDesignerFolder>Properties</AppDesignerFolder>
     <RootNamespace>S7.UnitTest</RootNamespace>
     <AssemblyName>S7Net.UnitTest</AssemblyName>
-    <TargetFrameworkVersion>v4.5</TargetFrameworkVersion>
+    <TargetFrameworkVersion>v3.5</TargetFrameworkVersion>
     <FileAlignment>512</FileAlignment>
     <ProjectTypeGuids>{3AC096D0-A1C2-E12C-1390-A8335801FDAB};{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}</ProjectTypeGuids>
     <VisualStudioVersion Condition="'$(VisualStudioVersion)' == ''">10.0</VisualStudioVersion>
diff --git a/S7.Net/S7.Net.csproj b/S7.Net/S7.Net.csproj
index 269b735..9632066 100644
--- a/S7.Net/S7.Net.csproj
+++ b/S7.Net/S7.Net.csproj
@@ -10,7 +10,7 @@
     <AppDesignerFolder>Properties</AppDesignerFolder>
     <RootNamespace>S7.Net</RootNamespace>
     <AssemblyName>S7.Net</AssemblyName>
-    <TargetFrameworkVersion>v4.5</TargetFrameworkVersion>
+    <TargetFrameworkVersion>v3.5</TargetFrameworkVersion>
     <FileAlignment>512</FileAlignment>
     <FileUpgradeFlags>
     </FileUpgradeFlags>
diff --git a/S7.Net/Types/Class.cs b/S7.Net/Types/Class.cs
index 3881e2c..9489afb 100644
--- a/S7.Net/Types/Class.cs
+++ b/S7.Net/Types/Class.cs
@@ -1,9 +1,4 @@
 using System;
-using System.Collections.Generic;
-using System.Globalization;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
 
 namespace S7.Net.Types
 {
@@ -11,8 +6,8 @@ namespace S7.Net.Types
     {
         /// <summary>
         /// Gets the size of the struct in bytes.
-        /// </summary>
-        /// <param name="structType">the type of the struct</param>
+        /// </summary>
+        /// <param name="classType">the type of the class</param>
         /// <returns>the number of bytes</returns>
         public static int GetClassSize(Type classType)
         {
@@ -27,8 +22,8 @@ namespace S7.Net.Types
 
         /// <summary>
         /// Given a property name, it returns the number of bytes that is composed
-        /// </summary>
-        /// <param name="propertyName"></param>
+        /// </summary>
+        /// <param name="propertyType">type of the property</param>
         /// <returns></returns>
         static double CalculateBytes(string propertyType)
         {
@@ -70,6 +65,7 @@ namespace S7.Net.Types
         /// <summary>
         /// Creates a struct of a specified type by an array of bytes.
         /// </summary>
+        /// <param name="sourceClass"></param>
         /// <param name="classType">The struct type</param>
         /// <param name="bytes">The array of bytes</param>
         /// <returns>The object depending on the struct type or null if fails(array-length != struct-length</returns>
@@ -97,14 +93,14 @@ namespace S7.Net.Types
                         bytePos = (int)Math.Floor(numBytes);
                         bitPos = (int)((numBytes - (double)bytePos) / 0.125);
                         if ((bytes[bytePos] & (int)Math.Pow(2, bitPos)) != 0)
-                            property.SetValue(sourceClass, true);
-                        else
-                            property.SetValue(sourceClass, false);
+                            property.SetValue(sourceClass, true, null);
+                        else
+                            property.SetValue(sourceClass, false, null);
                         numBytes += 0.125;
                         break;
                     case "Byte":
-                        numBytes = Math.Ceiling(numBytes);
-                        property.SetValue(sourceClass, (byte)(bytes[(int)numBytes]));
+                        numBytes = Math.Ceiling(numBytes);
+                        property.SetValue(sourceClass, (byte)(bytes[(int)numBytes]), null);
                         numBytes++;
                         break;
                     case "Int16":
@@ -112,16 +108,16 @@ namespace S7.Net.Types
                         if ((numBytes / 2 - Math.Floor(numBytes / 2.0)) > 0)
                             numBytes++;
                         // hier auswerten
-                        ushort source = Word.FromBytes(bytes[(int)numBytes + 1], bytes[(int)numBytes]);
-                        property.SetValue(sourceClass, source.ConvertToShort());
+                        ushort source = Word.FromBytes(bytes[(int)numBytes + 1], bytes[(int)numBytes]);
+                        property.SetValue(sourceClass, source.ConvertToShort(), null);
                         numBytes += 2;
                         break;
                     case "UInt16":
                         numBytes = Math.Ceiling(numBytes);
                         if ((numBytes / 2 - Math.Floor(numBytes / 2.0)) > 0)
                             numBytes++;
-                        // hier auswerten
-                        property.SetValue(sourceClass, Word.FromBytes(bytes[(int)numBytes + 1], bytes[(int)numBytes]));
+                        // hier auswerten
+                        property.SetValue(sourceClass, Word.FromBytes(bytes[(int)numBytes + 1], bytes[(int)numBytes]), null);
                         numBytes += 2;
                         break;
                     case "Int32":
@@ -132,8 +128,8 @@ namespace S7.Net.Types
                         uint sourceUInt = DWord.FromBytes(bytes[(int)numBytes + 3],
                                                                            bytes[(int)numBytes + 2],
                                                                            bytes[(int)numBytes + 1],
-                                                                           bytes[(int)numBytes + 0]);
-                        property.SetValue(sourceClass, sourceUInt.ConvertToInt());
+                                                                           bytes[(int)numBytes + 0]);
+                        property.SetValue(sourceClass, sourceUInt.ConvertToInt(), null);
                         numBytes += 4;
                         break;
                     case "UInt32":
@@ -143,8 +139,8 @@ namespace S7.Net.Types
                         // hier auswerten
                         property.SetValue(sourceClass, DWord.FromBytes(bytes[(int)numBytes],
                                                                            bytes[(int)numBytes + 1],
-                                                                           bytes[(int)numBytes + 2],
-                                                                           bytes[(int)numBytes + 3]));
+                                                                           bytes[(int)numBytes + 2],
+                                                                           bytes[(int)numBytes + 3]), null);
                         numBytes += 4;
                         break;
                     case "Double":
@@ -155,7 +151,7 @@ namespace S7.Net.Types
                         property.SetValue(sourceClass, Double.FromByteArray(new byte[] { bytes[(int)numBytes],
                                                                            bytes[(int)numBytes + 1],
                                                                            bytes[(int)numBytes + 2],
-                                                                           bytes[(int)numBytes + 3] }));
+                                                                           bytes[(int)numBytes + 3] }), null);
                         numBytes += 4;
                         break;
                 }
@@ -187,8 +183,8 @@ namespace S7.Net.Types
                     case "Boolean":
                         // get the value
                         bytePos = (int)Math.Floor(numBytes);
-                        bitPos = (int)((numBytes - (double)bytePos) / 0.125);
-                        if ((bool)property.GetValue(sourceClass))
+                        bitPos = (int)((numBytes - (double)bytePos) / 0.125);
+                        if ((bool)property.GetValue(sourceClass, null))
                             bytes[bytePos] |= (byte)Math.Pow(2, bitPos);            // is true
                         else
                             bytes[bytePos] &= (byte)(~(byte)Math.Pow(2, bitPos));   // is false
@@ -196,24 +192,24 @@ namespace S7.Net.Types
                         break;
                     case "Byte":
                         numBytes = (int)Math.Ceiling(numBytes);
-                        bytePos = (int)numBytes;
-                        bytes[bytePos] = (byte)property.GetValue(sourceClass);
+                        bytePos = (int)numBytes;
+                        bytes[bytePos] = (byte)property.GetValue(sourceClass, null);
                         numBytes++;
                         break;
-                    case "Int16":
-                        bytes2 = Int.ToByteArray((Int16)property.GetValue(sourceClass));
+                    case "Int16":
+                        bytes2 = Int.ToByteArray((Int16)property.GetValue(sourceClass, null));
                         break;
-                    case "UInt16":
-                        bytes2 = Word.ToByteArray((UInt16)property.GetValue(sourceClass));
+                    case "UInt16":
+                        bytes2 = Word.ToByteArray((UInt16)property.GetValue(sourceClass, null));
                         break;
-                    case "Int32":
-                        bytes2 = DInt.ToByteArray((Int32)property.GetValue(sourceClass));
+                    case "Int32":
+                        bytes2 = DInt.ToByteArray((Int32)property.GetValue(sourceClass, null));
                         break;
-                    case "UInt32":
-                        bytes2 = DWord.ToByteArray((UInt32)property.GetValue(sourceClass));
+                    case "UInt32":
+                        bytes2 = DWord.ToByteArray((UInt32)property.GetValue(sourceClass, null));
                         break;
-                    case "Double":
-                        bytes2 = Double.ToByteArray((double)property.GetValue(sourceClass));
+                    case "Double":
+                        bytes2 = Double.ToByteArray((double)property.GetValue(sourceClass, null));
                         break;
                 }
                 if (bytes2 != null)