diff --git a/include/Audio/SoundEffect.h b/include/Audio/SoundEffect.h
index a72d580..870f9b4 100644
--- a/include/Audio/SoundEffect.h
+++ b/include/Audio/SoundEffect.h
@@ -30,8 +30,11 @@ namespace XFX
 		private:
 			static float distanceScale;
 			static float dopplerScale;
+			TimeSpan duration;
+			bool isDisposed;
 			static float masterVolume;
 			static float speedOfSound;
+			float volume;
 
 			void Dispose(bool disposing);
 
diff --git a/include/System/Collections/Generic/List.h b/include/System/Collections/Generic/List.h
index 72eac18..07cdac5 100644
--- a/include/System/Collections/Generic/List.h
+++ b/include/System/Collections/Generic/List.h
@@ -86,10 +86,7 @@ namespace System
 							T* destinationArray = new T[value];
 							if (_size > 0)
 							{
-								for(int i = 0; i < _size; i++)
-								{
-									destinationArray[i] = _items[i];
-								}
+								memcpy(destinationArray, _items, _size * sizeof(T));
 							}
 							delete[] _items;
 							_items = destinationArray;
@@ -129,10 +126,7 @@ namespace System
 				{
 					_items = new T[obj._actualSize];
 
-					for (int i = 0; i < obj._size; i++)
-					{
-						_items[i] = obj._items[i];
-					}
+					memcpy(_items, obj._items, obj._size * sizeof(T));
 				}
 
 				~List()
@@ -140,7 +134,9 @@ namespace System
 					delete[] _items;
 				}
 
-				// Adds an element to the end of the list
+				/**
+				 * Adds an element to the end of the list
+				 */
  				void Add(const T& item)
 				{
 					if (_size == _actualSize)
@@ -151,7 +147,9 @@ namespace System
 					_version++;
 				}
 
-				//Removes all elements from the list
+				/**
+				 * Removes all elements from the list
+				 */
  				void Clear()
 				{
 					if (_size > 0)
@@ -181,15 +179,13 @@ namespace System
 				{
 					sassert(array != null, String::Format("array; %s", FrameworkResources::ArgumentNull_Generic));
 
-					for (int i = 0, j = arrayIndex; i < _size; i++, j++)
-					{
-						array[j] = _items[i];
-					}
+					memcpy(array, &_items[arrayIndex], _size * sizeof(T))
 				}
 
-				int GetType() const
+				static const Type& GetType()
 				{
-					//! TODO: implement
+					static Type ListTypeInfo("List", "System::Collections::Generic::List", TypeCode::Object, true);
+					return ListTypeInfo;
 				}
 
 				// Searches for the specified object and returns the zero-based index of the first occurrence within the entire List<>.
@@ -206,7 +202,7 @@ namespace System
 				// Inserts an element into the List<> at the specified index.
 				void Insert(const int index, const T& item)
 				{
-					sassert(index < _size, "Index must be within the bounds of the List.");
+					sassert(index >= 0 && index < _size, "Index must be within the bounds of the List.");
 
 					if (_size == _actualSize)
 					{
@@ -214,10 +210,7 @@ namespace System
 					}
 					if (index < _size)
 					{
-						for (int i = index, j = index + 1; i < _size - index; i++, j++)
-						{
-							_items[j] = _items[i];
-						}
+						memcpy(&_items[index + 1], &_items[index], (_size - index) * sizeof(T));
 					}
 					_items[index] = T(item);
 					_size++;
@@ -239,10 +232,7 @@ namespace System
 				// Removes the element at the specified index of the List<>.
 				void RemoveAt(const int index)
 				{
-					for (int i = index + 1, j = index; i < _size - index; i++, j++)
-					{
-						_items[j] = _items[i];
-					}
+					memcpy(&_items[index], &_items[index + 1], (size - index) * sizeof(T)):
 
 					_size--;
 					_version++;
@@ -262,15 +252,11 @@ namespace System
 						_size -= count;
 						if (index < _size)
 						{
-							for (int i = index + count, j = index; i < _size - index; i++, j++)
-							{
-								_items[j] = _items[i];
-							}
-						}
-						for (int i = _size; i < count; i++)
-						{
-							_items[i] = T();
+							memcpy(&_items[index], &_items[index + count], (_size - index) * sizeof(T));
 						}
+
+						memset(&_items[_size], 0, count * sizeof(T));
+
 						_version++;
 					}
 				}
@@ -341,8 +327,7 @@ namespace System
 				{
 					T* destinationArray = new T[_size];
 
-					for (int i = 0; i < _size; i++)
-						destinationArray[i] = _items[i];
+					memcpy(destinationArray, _items, _size * sizeof(T));
 
 					return destinationArray;
 				}
@@ -373,10 +358,7 @@ namespace System
 					_size = other._size;
 					_items = new T[other._actualSize];
 
-					for (int i = 0; i < other._size; i++)
-					{
-						_items[i] = other._items[i];
-					}
+					memcpy(_items, other._items, other._size * sizeof(T));
 
 					_version = other._version;
 					return *this;
diff --git a/include/System/Windows/DependencyObject.h b/include/System/Windows/DependencyObject.h
index c1ba97a..46f017d 100644
--- a/include/System/Windows/DependencyObject.h
+++ b/include/System/Windows/DependencyObject.h
@@ -8,6 +8,7 @@
 #define _SYSTEM_WINDOWS_DEPENDENCYOBJECT_
 
 #include <System/Collections/Generic/Dictionary.h>
+#include "DependencyProperty.h"
 
 using namespace System::Collections::Generic;
 
@@ -30,9 +31,7 @@ namespace System
 			template <typename T>
 			void ClearValue(DependencyProperty<T> p)
 			{
-				Derived_from<T, Object *>();
-
-				if (dependencyProperties.ContainsKey(p.Name)
+				if (dependencyProperties.ContainsKey(p.Name))
 				{
 					// Because wrapper classes and other types may be passed in-place,
 					// we explicitly destroy them as to prevent memory leaks.
@@ -48,20 +47,16 @@ namespace System
 			template <typename T>
 			T GetValue(DependencyProperty<T> p) const
 			{
-				Derived_from<T, Object *>();
-
 				return dependencyProperties[p.Name];
 			}
 
 			template <typename T>
 			void SetValue(DependencyProperty<T> p, T value)
 			{
-				Derived_from<T, Object *>();
-
 				if (!dependencyProperties.ContainsKey(p.Name))
 					dependencyProperties.Add(p.Name, value);
 				else
-					dependencyProperties[p] = value;
+					dependencyProperties[p.Name] = value;
 			}
 		};
 	}
diff --git a/include/System/Windows/DependencyProperty.h b/include/System/Windows/DependencyProperty.h
index 03275de..2585b50 100644
--- a/include/System/Windows/DependencyProperty.h
+++ b/include/System/Windows/DependencyProperty.h
@@ -23,7 +23,7 @@ namespace System
 		class DependencyProperty
 		{
 		private:
-			static Dictionary<int, Dictionary<String&, Object *> > _registeredProperties;
+			static Dictionary<Type, Dictionary<String, Object *> > _registeredProperties;
 
 			DependencyProperty(const String& propertyName, const Type& type, T defaultValue)
 				: DefaultValue(defaultValue), Name(propertyName)
@@ -70,17 +70,13 @@ namespace System
 		template <typename T>
 		DependencyProperty<T> DependencyProperty<T>::Register(const String& propertyName, const Type& type)
 		{
-			Derived_from<T, Object *>():
-
-			return Register(propertyName, type, new PropertyMetaData<T>(null));
+			return Register(propertyName, type, new PropertyMetadata<T>(null));
 		}
 
 		template <typename T>
 		DependencyProperty<T> DependencyProperty<T>::Register(const String& propertyName, const Type& type, PropertyMetadata<T> const * propertyMetaData)
 		{
-			Derived_from<T, Object *>():
-
-			_registeredProperties.Add(type, Dictionary<String&, Object *>());
+			_registeredProperties.Add(type, Dictionary<String, T>());
 			_registeredProperties[type].Add(propertyName, propertyMetaData->DefaultValue);
 
 			return DependencyProperty<T>(propertyName, type, propertyMetaData->DefaultValue);
diff --git a/include/System/Windows/FrameworkElement.h b/include/System/Windows/FrameworkElement.h
index 2870bf2..65fe40b 100644
--- a/include/System/Windows/FrameworkElement.h
+++ b/include/System/Windows/FrameworkElement.h
@@ -31,7 +31,7 @@ namespace System
 
 		public:
 			int Height;
-			static const DependencyProperty<Int32> HeightProperty;
+			static const DependencyProperty<int> HeightProperty;
 			HorizontalAlignment_t HorizontalAlignment;
 			static const DependencyProperty<HorizontalAlignment_t> HorizontalAlignmentProperty;
 			/**
@@ -48,7 +48,7 @@ namespace System
 			static const DependencyProperty<VerticalAlignment_t> VerticalAlignmentProperty;
 			int getWidth() const;
 			void setWidth(const int value);
-			static const DependencyProperty<Int32> WidthProperty;
+			static const DependencyProperty<int> WidthProperty;
 
 			virtual ~FrameworkElement();
 
diff --git a/include/Vector2.h b/include/Vector2.h
index 399388a..5ecfd3f 100644
--- a/include/Vector2.h
+++ b/include/Vector2.h
@@ -49,7 +49,7 @@ namespace XFX
 		bool			Equals(Object const * const obj) const;
 		bool			Equals(const Vector2 other) const;
 		int				GetHashCode() const;
-		int				GetType() const;
+		static int		GetType();
 		static Vector2	Hermite(const Vector2 value1, const Vector2 tangent1, const Vector2 value2, const Vector2 tangent2, const float amount);
 		static void		Hermite(const Vector2& value1, const Vector2& tangent1, const Vector2& value2, const Vector2& tangent2, const float amount, out Vector2& result);
 		float			Length() const;
diff --git a/src/libSystem.Windows/FrameworkElement.cpp b/src/libSystem.Windows/FrameworkElement.cpp
index cd6bc6a..e8afb46 100644
--- a/src/libSystem.Windows/FrameworkElement.cpp
+++ b/src/libSystem.Windows/FrameworkElement.cpp
@@ -28,17 +28,21 @@
 #include <System/Windows/FrameworkElement.h>
 #include <System/Windows/Size.h>
 
+#include <System/Type.h>
+
 namespace System
 {
 	namespace Windows
 	{
-		const DependencyProperty<Int32> FrameworkElement::HeightProperty = DependencyProperty<Int32>::Register("Height", FrameworkElement::GetType());
+		const DependencyProperty<int> FrameworkElement::HeightProperty = DependencyProperty<int>::Register("Height", FrameworkElement::GetType());
 
 		const DependencyProperty<Thickness> FrameworkElement::MarginProperty = DependencyProperty<Thickness>::Register("Margin", FrameworkElement::GetType());
 
 		const DependencyProperty<VerticalAlignment_t> FrameworkElement::VerticalAlignmentProperty = DependencyProperty<VerticalAlignment_t>::Register("VerticalAlignment", FrameworkElement::GetType());
 
-		const DependencyProperty<Int32> FrameworkElement::WidthProperty = DependencyProperty<Int32>::Register("Width", FrameworkElement::GetType());
+		const DependencyProperty<int> FrameworkElement::WidthProperty = DependencyProperty<int>::Register("Width", FrameworkElement::GetType());
+
+		const Type FrameworkElementTypeInfo("FrameworkElement", "System::Windows::FrameworkElement", TypeCode::Object);
 
 		Thickness FrameworkElement::getMargin() const
 		{
@@ -78,8 +82,9 @@ namespace System
 		{
 		}
 
-		int FrameworkElement::GetType()
+		const Type& FrameworkElement::GetType()
 		{
+			return FrameworkElementTypeInfo;
 		}
 
 		Size FrameworkElement::MeasureOverride(const Size finalSize)
diff --git a/src/libXFX.Game/Game.cpp b/src/libXFX.Game/Game.cpp
index a06fa4b..de9073f 100644
--- a/src/libXFX.Game/Game.cpp
+++ b/src/libXFX.Game/Game.cpp
@@ -39,6 +39,7 @@ extern "C"
 #include <Game.h>
 #include <System/Collections/Generic/List.h>
 #include <Graphics/GraphicsDevice.h>
+#include <System/Type.h>
 
 #include <sassert.h>
 
@@ -47,6 +48,8 @@ namespace XFX
 	const long long Game::DefaultTargetElapsedTicks = 10000000L / 60L;
 	const TimeSpan Game::maximumElapsedTime = TimeSpan::FromMilliseconds(500.0);
 	
+	const Type GameTypeInfo("Game", "XFX::Game", TypeCode::Object);
+
 	bool Game::IsActive()
 	{
 		return isActive;
@@ -145,7 +148,9 @@ namespace XFX
 	void Game::EndDraw()
 	{
 		if(graphicsManager)
+		{
 			graphicsManager->EndDraw();
+		}
 	}
 
 	void Game::EndRun()
@@ -158,8 +163,9 @@ namespace XFX
 		XReboot();
 	}
 
-	int Game::GetType()
+	const Type& Game::GetType()
 	{
+		return GameTypeInfo;
 	}
 
 	void Game::Initialize()
diff --git a/src/libXFX.Game/GameComponentCollection.cpp b/src/libXFX.Game/GameComponentCollection.cpp
index 23a6555..aade814 100644
--- a/src/libXFX.Game/GameComponentCollection.cpp
+++ b/src/libXFX.Game/GameComponentCollection.cpp
@@ -26,9 +26,13 @@
 // POSSIBILITY OF SUCH DAMAGE.
 
 #include <GameComponentCollection.h>
+#include <System/Type.h>
 
 namespace XFX
 {
+	const Type GameComponentCollectionTypeInfo("GameComponentCollection", "XFX::GameComponentCollection", TypeCode::Object);
+	const Type GameComponentCollectionEventArgsTypeInfo("GameComponentCollectionEventArgs", "XFX::GameComponentCollectionEventArgs", TypeCode::Object);
+
 	GameComponentCollection::GameComponentCollection()
 	{
 	}
@@ -47,8 +51,9 @@ namespace XFX
 		return _components.Count();
 	}
 
-	int GameComponentCollection::GetType()
+	const Type& GameComponentCollection::GetType()
 	{
+		return GameComponentCollectionTypeInfo;
 	}
 
 	void GameComponentCollection::InsertItem(int index, IGameComponent* item)
@@ -82,8 +87,9 @@ namespace XFX
 		return _gameComponent;
 	}
 
-	int GameComponentCollectionEventArgs::GetType()
+	const Type& GameComponentCollectionEventArgs::GetType()
 	{
+		return GameComponentCollectionEventArgsTypeInfo;
 	}
 
 	IGameComponent* GameComponentCollection::operator[](const int index)
diff --git a/src/libXFX.Game/GameTime.cpp b/src/libXFX.Game/GameTime.cpp
index 1ecf424..995a16b 100644
--- a/src/libXFX.Game/GameTime.cpp
+++ b/src/libXFX.Game/GameTime.cpp
@@ -26,9 +26,12 @@
 // POSSIBILITY OF SUCH DAMAGE.
 
 #include <GameTime.h>
+#include <System/Type.h>
 
 namespace XFX
 {
+	const Type GameTimeTypeInfo("GameTime", "XFX::GameTime", TypeCode::Object);
+
 	bool GameTime::IsRunningSlowly() const
 	{
 		return _isRunningSlowly;
@@ -58,7 +61,8 @@ namespace XFX
 	{
 	}
 
-	int GameTime::GetType()
+	const Type& GameTime::GetType()
 	{
+		return GameTimeTypeInfo;
 	}
 }
diff --git a/src/libXFX.Game/GamerServicesComponent.cpp b/src/libXFX.Game/GamerServicesComponent.cpp
index 6be60f1..51d30cd 100644
--- a/src/libXFX.Game/GamerServicesComponent.cpp
+++ b/src/libXFX.Game/GamerServicesComponent.cpp
@@ -26,18 +26,22 @@
 // POSSIBILITY OF SUCH DAMAGE.
 
 #include <GamerServices/GamerServicesComponent.h>
+#include <System/Type.h>
 
 namespace XFX
 {
 	namespace GamerServices
 	{
+		const Type GamerServicesComponentTypeInfo("GamerServicesComponent", "XFX::GamerServicesComponent", TypeCode::Object);
+
 		GamerServicesComponent::GamerServicesComponent(Game * const game)
 			: GameComponent(game)
 		{
 		}
 
-		int GamerServicesComponent::GetType()
+		const Type& GamerServicesComponent::GetType()
 		{
+			return GamerServicesComponentTypeInfo;
 		}
 
 		void GamerServicesComponent::Initialize()
diff --git a/src/libXFX.Game/GraphicsDeviceManager.cpp b/src/libXFX.Game/GraphicsDeviceManager.cpp
index 9adb0d4..36fbd38 100644
--- a/src/libXFX.Game/GraphicsDeviceManager.cpp
+++ b/src/libXFX.Game/GraphicsDeviceManager.cpp
@@ -28,6 +28,7 @@
 #include <GraphicsDeviceManager.h>
 #include <Game.h>
 #include <System/Event.h>
+#include <System/Type.h>
 
 #include <sassert.h>
 
@@ -45,6 +46,8 @@ namespace XFX
 	SurfaceFormat_t GraphicsDeviceManager::ValidAdapterFormats[] = { SurfaceFormat::Bgr565 }; // TODO figure out which ones are really supported
 	SurfaceFormat_t GraphicsDeviceManager::ValidBackBufferFormats[] = { SurfaceFormat::Bgr565, SurfaceFormat::Bgra5551, SurfaceFormat::Color }; // idem
 
+	const Type GraphicsDeviceManagerTypeInfo("GraphicsDeviceManager", "XFX::GraphicsDeviceManager", TypeCode::Object);
+
 	GraphicsDeviceManager::GraphicsDeviceManager(Game * const game)
 		: _game(game), backBufferFormat(SurfaceFormat::Color), backBufferHeight(DefaultBackBufferHeight), backBufferWidth(DefaultBackBufferWidth)
 	{
@@ -140,8 +143,9 @@ namespace XFX
 		graphicsDevice->Present();
 	}
 
-	int GraphicsDeviceManager::GetType()
+	const Type& GraphicsDeviceManager::GetType()
 	{
+		return GraphicsDeviceManagerTypeInfo;
 	}
 
 	void GraphicsDeviceManager::OnDeviceCreated(Object* sender, EventArgs* args)
diff --git a/src/libXFX/SoundEffect.cpp b/src/libXFX/SoundEffect.cpp
index 42f07a0..b72c726 100644
--- a/src/libXFX/SoundEffect.cpp
+++ b/src/libXFX/SoundEffect.cpp
@@ -28,7 +28,9 @@
 #include <Audio/SoundEffect.h>
 #include <Audio/SoundEffectInstance.h>
 
+#include <System/FrameworkResources.h>
 #include <System/Single.h>
+#include <System/Type.h>
 
 #include <sassert.h>
 
@@ -38,6 +40,8 @@ namespace XFX
 	{
 		float SoundEffect::masterVolume = 1.0f;
 
+		const Type SoundEffectTypeInfo("SoundEffect", "XFX::Audio::SoundEffect", TypeCode::Object);
+
 		float SoundEffect::getDistanceScale()
 		{
 			return distanceScale;
@@ -59,7 +63,7 @@ namespace XFX
 
 		void SoundEffect::setDopplerScale(float value)
 		{
-			sassert(value >= 0, "");
+			sassert(value >= 0, String::Format("value; %s", FrameworkResources::ArgumentOutOfRange_NeedNonNegNum));
 		
 			dopplerScale = value;
 
@@ -113,6 +117,12 @@ namespace XFX
 
 		void SoundEffect::Dispose(bool disposing)
 		{
+			if (!isDisposed)
+			{
+				if (disposing)
+				{
+				}
+			}
 		}
 
 		SoundEffect* SoundEffect::FromStream(Stream * const stream)
@@ -120,8 +130,9 @@ namespace XFX
 			
 		}
 
-		int SoundEffect::GetType() const
+		const Type& SoundEffect::GetType()
 		{
+			return SoundEffectTypeInfo;
 		}
 
 		bool SoundEffect::Play()
diff --git a/src/libmscorlib/Byte.cpp b/src/libmscorlib/Byte.cpp
index 40f0bad..722b2b0 100644
--- a/src/libmscorlib/Byte.cpp
+++ b/src/libmscorlib/Byte.cpp
@@ -27,6 +27,7 @@
 
 #include <System/Byte.h>
 #include <System/String.h>
+#include <System/Type.h>
 #include <stdlib.h>
 
 namespace System
@@ -34,6 +35,8 @@ namespace System
 	const byte Byte::MaxValue = 255;
 	const byte Byte::MinValue = 0;
 
+	const Type ByteTypeInfo("Byte", "System::Byte", TypeCode::Byte);
+
 	Byte::Byte()
 		: value(0)
 	{
@@ -63,9 +66,9 @@ namespace System
 		return (value == other.value);
 	}
 
-	int Byte::GetType()
+	const Type& Byte::GetType()
 	{
-		return 6;
+		return ByteTypeInfo;
 	}
 
 	const String Byte::ToString() const
@@ -73,7 +76,7 @@ namespace System
 		return String::Format("%i", value);
 	}
 
-	const String& Byte::ToString(byte value)
+	const String Byte::ToString(byte value)
 	{
 		return String::Format("%i", value);
 	}
diff --git a/src/libmscorlib/DateTime.cpp b/src/libmscorlib/DateTime.cpp
index 55c833e..9a59c8a 100644
--- a/src/libmscorlib/DateTime.cpp
+++ b/src/libmscorlib/DateTime.cpp
@@ -33,6 +33,8 @@
 #include <System/TimeZone.h>
 #include <System/Type.h>
 
+#include <xboxkrnl/xboxkrnl.h>
+
 #include <sassert.h>
 
 namespace System
@@ -295,7 +297,7 @@ namespace System
 		return (int)encoded;
 	}
 
-	Type DateTime::GetType()
+	const Type& DateTime::GetType()
 	{
 		return DateTimeTypeInfo;
 	}
diff --git a/src/libmscorlib/Double.cpp b/src/libmscorlib/Double.cpp
index 038a0da..bc3f5fe 100644
--- a/src/libmscorlib/Double.cpp
+++ b/src/libmscorlib/Double.cpp
@@ -79,7 +79,7 @@ namespace System
 		return (int)value;
 	}
 
-	Type Double::GetType()
+	const Type& Double::GetType()
 	{
 		return DoubleTypeInfo;
 	}