diff --git a/mcs/class/corlib/System/ChangeLog b/mcs/class/corlib/System/ChangeLog
index 42211afb5821f..4a9ee5cd5b8ba 100644
--- a/mcs/class/corlib/System/ChangeLog
+++ b/mcs/class/corlib/System/ChangeLog
@@ -1,3 +1,10 @@
+2009-10-07  Sebastien Pouliot  <sebastien@ximian.com>
+
+	* String.cs: Remove unsafe code duplication in ToCharArray.
+	Define out the unused InternalStrcpy icalls
+	* StringComparer.cs: Seal internal/private inner classes.
+	[Backport r143651]
+
 2009-10-06  Sebastien Pouliot  <sebastien@ximian.com>
 
 	* Decimal.cs: Use Compare method instead of directly using the
diff --git a/mcs/class/corlib/System/String.cs b/mcs/class/corlib/System/String.cs
index 05efca83a0baa..7fe8828ce7758 100644
--- a/mcs/class/corlib/System/String.cs
+++ b/mcs/class/corlib/System/String.cs
@@ -184,12 +184,9 @@ public unsafe void CopyTo (int sourceIndex, char[] destination, int destinationI
 				CharCopy (dest + destinationIndex, src + sourceIndex, count);
 		}
 
-		public unsafe char[] ToCharArray ()
+		public char[] ToCharArray ()
 		{
-			char[] tmp = new char [length];
-			fixed (char* dest = tmp, src = this)
-				CharCopy (dest, src, length);
-			return tmp;
+			return ToCharArray (0, length);
 		}
 
 		public unsafe char[] ToCharArray (int startIndex, int length)
@@ -3077,7 +3074,7 @@ internal static unsafe void CharCopyReverse (String target, int targetIndex, Str
 
 		[MethodImplAttribute (MethodImplOptions.InternalCall)]
 		internal extern static String InternalAllocateStr (int length);
-
+#if false
 		[MethodImplAttribute (MethodImplOptions.InternalCall)]
 		internal extern static void InternalStrcpy (String dest, int destPos, String src);
 
@@ -3089,7 +3086,7 @@ internal static unsafe void CharCopyReverse (String target, int targetIndex, Str
 
 		[MethodImplAttribute (MethodImplOptions.InternalCall)]
 		internal extern static void InternalStrcpy (String dest, int destPos, char[] chars, int sPos, int count);
-
+#endif
 		[MethodImplAttribute (MethodImplOptions.InternalCall)]
 		private extern static string InternalIntern (string str);
 
diff --git a/mcs/class/corlib/System/StringComparer.cs b/mcs/class/corlib/System/StringComparer.cs
index 84f76b190443e..54be9eda647cb 100644
--- a/mcs/class/corlib/System/StringComparer.cs
+++ b/mcs/class/corlib/System/StringComparer.cs
@@ -145,7 +145,7 @@ public int GetHashCode (object obj)
 	}
 
 	[Serializable]
-	class CultureAwareComparer : StringComparer
+	sealed class CultureAwareComparer : StringComparer
 	{
 		readonly bool _ignoreCase;
 		readonly CompareInfo _compareInfo;
@@ -180,7 +180,7 @@ public override int GetHashCode (string s)
 	}
 
 	[Serializable]
-	internal class OrdinalComparer : StringComparer
+	internal sealed class OrdinalComparer : StringComparer
 	{
 		readonly bool _ignoreCase;