diff --git a/corlib/System.Reflection/ICustomAttributeProvider.cs b/corlib/System.Reflection/ICustomAttributeProvider.cs
new file mode 100644
index 0000000..3950b63
--- /dev/null
+++ b/corlib/System.Reflection/ICustomAttributeProvider.cs
@@ -0,0 +1,36 @@
+// Copyright (c) 2012 DotNetAnywhere
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+#if !LOCALTEST
+
+namespace System.Reflection {
+
+	public interface ICustomAttributeProvider {
+
+		bool IsDefined(Type attributeType, bool inherit);
+
+		Object[] GetCustomAttributes(bool inherit);
+
+		Object[] GetCustomAttributes(Type attributeType, bool inherit);
+	}
+
+}
+
+#endif
diff --git a/corlib/System.Reflection/MemberInfo.cs b/corlib/System.Reflection/MemberInfo.cs
index 3a239db..3a3c77d 100644
--- a/corlib/System.Reflection/MemberInfo.cs
+++ b/corlib/System.Reflection/MemberInfo.cs
@@ -20,18 +20,19 @@
 
 #if !LOCALTEST
 
-using System;
-using System.Collections.Generic;
-using System.Text;
-
 namespace System.Reflection {
-	public abstract class MemberInfo {
+	public abstract class MemberInfo : ICustomAttributeProvider {
 
 		protected MemberInfo() {
 		}
 
 		public abstract string Name { get;}
 
+		public abstract bool IsDefined(Type attributeType, bool inherit);
+
+		public abstract Object[] GetCustomAttributes(bool inherit);
+
+		public abstract Object[] GetCustomAttributes(Type attributeType, bool inherit);
 	}
 }
 
diff --git a/corlib/System/Attribute.cs b/corlib/System/Attribute.cs
index 83b3af6..4b48459 100644
--- a/corlib/System/Attribute.cs
+++ b/corlib/System/Attribute.cs
@@ -18,10 +18,24 @@
 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 // THE SOFTWARE.
 
+using System.Collections.Generic;
+using System.Reflection;
+
 #if !LOCALTEST
 
 namespace System {
 	public abstract class Attribute {
+
+		public virtual object TypeId {
+			get {
+				return this.GetType();
+			}
+		}
+
+		public static IEnumerable<Attribute> GetCustomAttributes(MemberInfo element, bool inherit)
+		{
+			return null;
+		}
 	}
 }
 
diff --git a/corlib/System/RuntimeType.cs b/corlib/System/RuntimeType.cs
index 6293476..1395f58 100644
--- a/corlib/System/RuntimeType.cs
+++ b/corlib/System/RuntimeType.cs
@@ -20,13 +20,14 @@
 
 #if !LOCALTEST
 
+using System.Reflection;
 using System.Runtime.CompilerServices;
 using System.Text;
 using System.Collections.Generic;
 
 namespace System {
 
-	class RuntimeType : Type {
+	sealed class RuntimeType : Type {
 
 		[MethodImpl(MethodImplOptions.InternalCall)]
 		extern private RuntimeType GetNestingParentType();
@@ -93,6 +94,24 @@
 		[MethodImpl(MethodImplOptions.InternalCall)]
 		extern public override Type[] GetGenericArguments();
 
+		[MethodImpl(MethodImplOptions.InternalCall)]
+		extern public override bool IsDefined(Type attributeType, bool inherit);
+
+		public override Object[] GetCustomAttributes(bool inherit)
+		{
+			return Internal_GetCustomAttributes(null, inherit);
+		}
+
+		public override Object[] GetCustomAttributes(Type attributeType, bool inherit)
+		{
+			if (attributeType == null)
+				throw new ArgumentNullException();
+
+			return Internal_GetCustomAttributes(attributeType, inherit);
+		}
+
+		[MethodImpl(MethodImplOptions.InternalCall)]
+		extern private Object[] Internal_GetCustomAttributes(Type attributeType, bool inherit);
 	}
 
 }
diff --git a/dna/InternalCall.c b/dna/InternalCall.c
index 4e7a3ab..30c5c2c 100644
--- a/dna/InternalCall.c
+++ b/dna/InternalCall.c
@@ -106,6 +106,8 @@
 	{NULL, NULL,          "get_IsGenericType", System_RuntimeType_get_IsGenericType, TYPE_SYSTEM_BOOLEAN, 0},
 	{NULL, NULL,          "Internal_GetGenericTypeDefinition", System_RuntimeType_Internal_GetGenericTypeDefinition, TYPE_SYSTEM_RUNTIMETYPE, 0},
 	{NULL, NULL,          "GetGenericArguments", System_RuntimeType_GetGenericArguments, TYPE_SYSTEM_ARRAY_TYPE, 0},
+	{NULL, NULL,          "IsDefined", System_RuntimeType_IsDefined, TYPE_SYSTEM_BOOLEAN, 2, {TYPE_SYSTEM_TYPE, TYPE_SYSTEM_BOOLEAN}},
+	{NULL, NULL,          "Internal_GetCustomAttributes", System_RuntimeType_GetCustomAttributes, TYPE_SYSTEM_ARRAY_OBJECT, 2, {TYPE_SYSTEM_TYPE, TYPE_SYSTEM_BOOLEAN}},
 
 	{NULL, "Char", "GetUnicodeCategory", System_Char_GetUnicodeCategory, TYPE_SYSTEM_GLOBALIZATION_UNICODECATEGORY, 1, {TYPE_SYSTEM_CHAR}},
 	{NULL, NULL  , "ToLowerInvariant", System_Char_ToLowerInvariant, TYPE_SYSTEM_CHAR, 1, {TYPE_SYSTEM_CHAR}},
diff --git a/dna/System.RuntimeType.c b/dna/System.RuntimeType.c
index 363ea07..e5409b6 100644
--- a/dna/System.RuntimeType.c
+++ b/dna/System.RuntimeType.c
@@ -146,6 +146,16 @@
 	return NULL;
 }
 
+tAsyncCall* System_RuntimeType_IsDefined(PTR pThis_, PTR pParams, PTR pReturnValue) {
+	tMD_TypeDef *pType = ((tRuntimeType*)pThis_)->pTypeDef;
+	return NULL;
+}
+
+tAsyncCall* System_RuntimeType_GetCustomAttributes(PTR pThis_, PTR pParams, PTR pReturnValue) {
+	tMD_TypeDef *pType = ((tRuntimeType*)pThis_)->pTypeDef;
+	return NULL;
+}
+
 tMD_TypeDef* RuntimeType_DeRef(PTR type) {
 	return ((tRuntimeType*)type)->pTypeDef;
 }
\ No newline at end of file
diff --git a/dna/System.RuntimeType.h b/dna/System.RuntimeType.h
index 66c191e..8376112 100644
--- a/dna/System.RuntimeType.h
+++ b/dna/System.RuntimeType.h
@@ -38,6 +38,8 @@
 tAsyncCall* System_RuntimeType_get_IsGenericType(PTR pThis_, PTR pParams, PTR pReturnValue);
 tAsyncCall* System_RuntimeType_Internal_GetGenericTypeDefinition(PTR pThis_, PTR pParams, PTR pReturnValue);
 tAsyncCall* System_RuntimeType_GetGenericArguments(PTR pThis_, PTR pParams, PTR pReturnValue);
+tAsyncCall* System_RuntimeType_IsDefined(PTR pThis_, PTR pParams, PTR pReturnValue);
+tAsyncCall* System_RuntimeType_GetCustomAttributes(PTR pThis_, PTR pParams, PTR pReturnValue);
 
 // Create a new heap object which is the RuntimeType object for the given type.
 HEAP_PTR RuntimeType_New(tMD_TypeDef *pTypeDef);