diff --git a/src/mscorlib/src/System/ArraySegment.cs b/src/mscorlib/src/System/ArraySegment.cs
index d6d26f13e5d6..bc39c2474f6b 100644
--- a/src/mscorlib/src/System/ArraySegment.cs
+++ b/src/mscorlib/src/System/ArraySegment.cs
@@ -35,7 +35,7 @@ public struct ArraySegment<T> : IList<T>, IReadOnlyList<T>
         public ArraySegment(T[] array)
         {
             if (array == null)
-                throw new ArgumentNullException("array");
+                ThrowHelper.ThrowArgumentNullException(ExceptionArgument.array);
             Contract.EndContractBlock();
 
             _array = array;
@@ -46,13 +46,13 @@ public ArraySegment(T[] array)
         public ArraySegment(T[] array, int offset, int count)
         {
             if (array == null)
-                throw new ArgumentNullException("array");
+                ThrowHelper.ThrowArgumentNullException(ExceptionArgument.array);
             if (offset < 0)
-                throw new ArgumentOutOfRangeException("offset", Environment.GetResourceString("ArgumentOutOfRange_NeedNonNegNum"));
+                ThrowHelper.ThrowArgumentOutOfRangeException(ExceptionArgument.offset, ExceptionResource.ArgumentOutOfRange_NeedNonNegNum);
             if (count < 0)
-                throw new ArgumentOutOfRangeException("count", Environment.GetResourceString("ArgumentOutOfRange_NeedNonNegNum"));
+                ThrowHelper.ThrowArgumentOutOfRangeException(ExceptionArgument.count, ExceptionResource.ArgumentOutOfRange_NeedNonNegNum);
             if (array.Length - offset < count)
-                throw new ArgumentException(Environment.GetResourceString("Argument_InvalidOffLen"));
+                ThrowHelper.ThrowArgumentException(ExceptionResource.Argument_InvalidOffLen);
             Contract.EndContractBlock();
 
             _array = array;
@@ -146,9 +146,9 @@ T IList<T>.this[int index]
             get
             {
                 if (_array == null)
-                    throw new InvalidOperationException(Environment.GetResourceString("InvalidOperation_NullArray"));
+                    ThrowHelper.ThrowInvalidOperationException(ExceptionResource.InvalidOperation_NullArray);
                 if (index < 0 || index >=  _count)
-                    throw new ArgumentOutOfRangeException("index");
+                    ThrowHelper.ThrowArgumentOutOfRange_IndexException();
                 Contract.EndContractBlock();
 
                 return _array[_offset + index];
@@ -157,9 +157,9 @@ T IList<T>.this[int index]
             set
             {
                 if (_array == null)
-                    throw new InvalidOperationException(Environment.GetResourceString("InvalidOperation_NullArray"));
+                    ThrowHelper.ThrowInvalidOperationException(ExceptionResource.InvalidOperation_NullArray);
                 if (index < 0 || index >= _count)
-                    throw new ArgumentOutOfRangeException("index");
+                    ThrowHelper.ThrowArgumentOutOfRange_IndexException();
                 Contract.EndContractBlock();
 
                 _array[_offset + index] = value;
@@ -169,7 +169,7 @@ T IList<T>.this[int index]
         int IList<T>.IndexOf(T item)
         {
             if (_array == null)
-                throw new InvalidOperationException(Environment.GetResourceString("InvalidOperation_NullArray"));
+                ThrowHelper.ThrowInvalidOperationException(ExceptionResource.InvalidOperation_NullArray);
             Contract.EndContractBlock();
 
             int index = System.Array.IndexOf<T>(_array, item, _offset, _count);
@@ -182,12 +182,12 @@ int IList<T>.IndexOf(T item)
 
         void IList<T>.Insert(int index, T item)
         {
-            throw new NotSupportedException();
+            ThrowHelper.ThrowNotSupportedException();
         }
 
         void IList<T>.RemoveAt(int index)
         {
-            throw new NotSupportedException();
+            ThrowHelper.ThrowNotSupportedException();
         }
         #endregion
 
@@ -197,9 +197,9 @@ T IReadOnlyList<T>.this[int index]
             get
             {
                 if (_array == null)
-                    throw new InvalidOperationException(Environment.GetResourceString("InvalidOperation_NullArray"));
+                    ThrowHelper.ThrowInvalidOperationException(ExceptionResource.InvalidOperation_NullArray);
                 if (index < 0 || index >= _count)
-                    throw new ArgumentOutOfRangeException("index");
+                    ThrowHelper.ThrowArgumentOutOfRange_IndexException();
                 Contract.EndContractBlock();
 
                 return _array[_offset + index];
@@ -220,18 +220,18 @@ bool ICollection<T>.IsReadOnly
 
         void ICollection<T>.Add(T item)
         {
-            throw new NotSupportedException();
+            ThrowHelper.ThrowNotSupportedException();
         }
 
         void ICollection<T>.Clear()
         {
-            throw new NotSupportedException();
+            ThrowHelper.ThrowNotSupportedException();
         }
 
         bool ICollection<T>.Contains(T item)
         {
             if (_array == null)
-                throw new InvalidOperationException(Environment.GetResourceString("InvalidOperation_NullArray"));
+                ThrowHelper.ThrowInvalidOperationException(ExceptionResource.InvalidOperation_NullArray);
             Contract.EndContractBlock();
 
             int index = System.Array.IndexOf<T>(_array, item, _offset, _count);
@@ -245,7 +245,7 @@ bool ICollection<T>.Contains(T item)
         void ICollection<T>.CopyTo(T[] array, int arrayIndex)
         {
             if (_array == null)
-                throw new InvalidOperationException(Environment.GetResourceString("InvalidOperation_NullArray"));
+                ThrowHelper.ThrowInvalidOperationException(ExceptionResource.InvalidOperation_NullArray);
             Contract.EndContractBlock();
 
             System.Array.Copy(_array, _offset, array, arrayIndex, _count);
@@ -253,7 +253,8 @@ void ICollection<T>.CopyTo(T[] array, int arrayIndex)
 
         bool ICollection<T>.Remove(T item)
         {
-            throw new NotSupportedException();
+            ThrowHelper.ThrowNotSupportedException();
+            return default(bool);
         }
         #endregion
 
@@ -261,7 +262,7 @@ bool ICollection<T>.Remove(T item)
         IEnumerator<T> IEnumerable<T>.GetEnumerator()
         {
             if (_array == null)
-                throw new InvalidOperationException(Environment.GetResourceString("InvalidOperation_NullArray"));
+                ThrowHelper.ThrowInvalidOperationException(ExceptionResource.InvalidOperation_NullArray);
             Contract.EndContractBlock();
 
             return new ArraySegmentEnumerator(this);
@@ -272,7 +273,7 @@ IEnumerator<T> IEnumerable<T>.GetEnumerator()
         IEnumerator IEnumerable.GetEnumerator()
         {
             if (_array == null)
-                throw new InvalidOperationException(Environment.GetResourceString("InvalidOperation_NullArray"));
+                ThrowHelper.ThrowInvalidOperationException(ExceptionResource.InvalidOperation_NullArray);
             Contract.EndContractBlock();
 
             return new ArraySegmentEnumerator(this);
@@ -314,8 +315,8 @@ public T Current
             {
                 get
                 {
-                    if (_current < _start) throw new InvalidOperationException(Environment.GetResourceString(ResId.InvalidOperation_EnumNotStarted));
-                    if (_current >= _end) throw new InvalidOperationException(Environment.GetResourceString(ResId.InvalidOperation_EnumEnded));
+                    if (_current < _start) ThrowHelper.ThrowInvalidOperationException(ExceptionResource.InvalidOperation_EnumNotStarted);
+                    if (_current >= _end) ThrowHelper.ThrowInvalidOperationException(ExceptionResource.InvalidOperation_EnumEnded);
                     return _array[_current];
                 }
             }
diff --git a/src/mscorlib/src/System/ThrowHelper.cs b/src/mscorlib/src/System/ThrowHelper.cs
index f3271769cc25..a021c9d74089 100644
--- a/src/mscorlib/src/System/ThrowHelper.cs
+++ b/src/mscorlib/src/System/ThrowHelper.cs
@@ -110,6 +110,11 @@ internal static void ThrowObjectDisposedException(string objectName, ExceptionRe
             throw new ObjectDisposedException(objectName, Environment.GetResourceString(GetResourceName(resource)));
         }
 
+        internal static void ThrowNotSupportedException()
+        {
+            throw new NotSupportedException();
+        }
+
         // Allow nulls for reference types and Nullable<U>, but not for value types.
         // Aggressively inline so the jit evaluates the if in place and either drops the call altogether
         // Or just leaves null test and call to the Non-returning ThrowHelper.ThrowArgumentNullException
@@ -171,7 +176,9 @@ internal enum ExceptionArgument {
         view,
         sourceBytesToCopy,
         action,
-        comparison
+        comparison,
+        offset,
+
     }
 
     //
@@ -225,7 +232,9 @@ internal enum ExceptionResource {
         ObjectDisposed_RegKeyClosed,
         NotSupported_InComparableType,
         Argument_InvalidRegistryOptionsCheck,
-        Argument_InvalidRegistryViewCheck
+        Argument_InvalidRegistryViewCheck,
+        InvalidOperation_NullArray,
+
     }
 }