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diff --git a/src/mscorlib/src/System/Resources/ResourceSet.cs b/src/mscorlib/src/System/Resources/ResourceSet.cs
new file mode 100644
index 0000000000..b135f2817e
--- /dev/null
+++ b/src/mscorlib/src/System/Resources/ResourceSet.cs
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+// Copyright (c) Microsoft. All rights reserved.
+// Licensed under the MIT license. See LICENSE file in the project root for full license information.
+
+/*============================================================
+**
+**
+** 
+**
+**
+** Purpose: Culture-specific collection of resources.
+**
+** 
+===========================================================*/
+namespace System.Resources {
+    using System;
+    using System.Collections;
+    using System.IO;
+    using System.Globalization;
+    using System.Security.Permissions;
+    using System.Runtime.InteropServices;
+    using System.Reflection;
+    using System.Runtime.Serialization;
+    using System.Runtime.Versioning;
+    using System.Diagnostics.Contracts;
+
+    // A ResourceSet stores all the resources defined in one particular CultureInfo.
+    // 
+    // The method used to load resources is straightforward - this class
+    // enumerates over an IResourceReader, loading every name and value, and 
+    // stores them in a hash table.  Custom IResourceReaders can be used.
+    // 
+    [Serializable]
+[System.Runtime.InteropServices.ComVisible(true)]
+    public class ResourceSet : IDisposable, IEnumerable
+    {
+        [NonSerialized] protected IResourceReader Reader;
+#if FEATURE_CORECLR
+        internal Hashtable Table;
+#else
+        protected Hashtable Table;
+#endif
+
+        private Hashtable _caseInsensitiveTable;  // For case-insensitive lookups.
+
+#if LOOSELY_LINKED_RESOURCE_REFERENCE
+        [OptionalField]
+        private Assembly _assembly;  // For LooselyLinkedResourceReferences
+#endif // LOOSELY_LINKED_RESOURCE_REFERENCE
+
+        protected ResourceSet()
+        {
+            // To not inconvenience people subclassing us, we should allocate a new
+            // hashtable here just so that Table is set to something.
+            CommonInit();
+        }
+
+        // For RuntimeResourceSet, ignore the Table parameter - it's a wasted 
+        // allocation.
+        internal ResourceSet(bool junk)
+        {
+        }
+
+        // Creates a ResourceSet using the system default ResourceReader
+        // implementation.  Use this constructor to open & read from a file 
+        // on disk.
+        // 
+        #if FEATURE_CORECLR
+        [System.Security.SecurityCritical] // auto-generated
+        #endif
+        public ResourceSet(String fileName)
+        {
+            Reader = new ResourceReader(fileName);
+            CommonInit();
+            ReadResources();
+        }
+
+#if LOOSELY_LINKED_RESOURCE_REFERENCE
+        public ResourceSet(String fileName, Assembly assembly)
+        {
+            Reader = new ResourceReader(fileName);
+            CommonInit();
+            _assembly = assembly;
+            ReadResources();
+        }
+#endif // LOOSELY_LINKED_RESOURCE_REFERENCE
+    
+        // Creates a ResourceSet using the system default ResourceReader
+        // implementation.  Use this constructor to read from an open stream 
+        // of data.
+        // 
+        [System.Security.SecurityCritical]  // auto-generated_required
+        public ResourceSet(Stream stream)
+        {
+            Reader = new ResourceReader(stream);
+            CommonInit();
+            ReadResources();
+        }
+
+#if LOOSELY_LINKED_RESOURCE_REFERENCE
+        [System.Security.SecurityCritical]  // auto_generated_required
+        public ResourceSet(Stream stream, Assembly assembly)
+        {
+            Reader = new ResourceReader(stream);
+            CommonInit();
+            _assembly = assembly;
+            ReadResources();
+        }
+#endif // LOOSELY_LINKED_RESOURCE_REFERENCE
+
+        public ResourceSet(IResourceReader reader)
+        {
+            if (reader == null)
+                throw new ArgumentNullException("reader");
+            Contract.EndContractBlock();
+            Reader = reader;
+            CommonInit();
+            ReadResources();
+        }
+
+#if LOOSELY_LINKED_RESOURCE_REFERENCE
+        public ResourceSet(IResourceReader reader, Assembly assembly)
+        {
+            if (reader == null)
+                throw new ArgumentNullException("reader");
+            Contract.EndContractBlock();
+            Reader = reader;
+            CommonInit();
+            _assembly = assembly;
+            ReadResources();
+        }
+#endif // LOOSELY_LINKED_RESOURCE_REFERENCE
+    
+        private void CommonInit()
+        {
+            Table = new Hashtable();
+        }
+
+        // Closes and releases any resources used by this ResourceSet, if any.
+        // All calls to methods on the ResourceSet after a call to close may 
+        // fail.  Close is guaranteed to be safely callable multiple times on a 
+        // particular ResourceSet, and all subclasses must support these semantics.
+        public virtual void Close()
+        {
+            Dispose(true);
+        }
+        
+        protected virtual void Dispose(bool disposing)
+        {
+            if (disposing) {
+                // Close the Reader in a thread-safe way.
+                IResourceReader copyOfReader = Reader;
+                Reader = null;
+                if (copyOfReader != null)
+                    copyOfReader.Close();
+            }
+            Reader = null;
+            _caseInsensitiveTable = null;
+            Table = null;
+        }
+
+        public void Dispose()
+        {
+            Dispose(true);
+        }
+
+#if LOOSELY_LINKED_RESOURCE_REFERENCE
+        // Optional - used for resolving assembly manifest resource references.
+        // This can safely be null.
+        [ComVisible(false)]
+        public Assembly Assembly {
+            get { return _assembly; }
+            /*protected*/ set { _assembly = value; }
+        }
+#endif // LOOSELY_LINKED_RESOURCE_REFERENCE
+
+        // Returns the preferred IResourceReader class for this kind of ResourceSet.
+        // Subclasses of ResourceSet using their own Readers &; should override
+        // GetDefaultReader and GetDefaultWriter.
+        public virtual Type GetDefaultReader()
+        {
+            return typeof(ResourceReader);
+        }
+    
+#if !FEATURE_CORECLR
+        // Returns the preferred IResourceWriter class for this kind of ResourceSet.
+        // Subclasses of ResourceSet using their own Readers &; should override
+        // GetDefaultReader and GetDefaultWriter.
+        public virtual Type GetDefaultWriter()
+        {
+            return typeof(ResourceWriter);
+        }
+#endif // !FEATURE_CORECLR
+
+        [ComVisible(false)]
+        public virtual IDictionaryEnumerator GetEnumerator()
+        {
+            return GetEnumeratorHelper();
+        }
+
+        /// <internalonly/>
+        IEnumerator IEnumerable.GetEnumerator()
+        {
+            return GetEnumeratorHelper();
+        }
+
+        private IDictionaryEnumerator GetEnumeratorHelper()
+        {
+            Hashtable copyOfTable = Table;  // Avoid a race with Dispose
+            if (copyOfTable == null)
+                throw new ObjectDisposedException(null, Environment.GetResourceString("ObjectDisposed_ResourceSet"));
+            return copyOfTable.GetEnumerator();
+        }
+
+        // Look up a string value for a resource given its name.
+        // 
+        public virtual String GetString(String name)
+        {
+            Object obj = GetObjectInternal(name);
+            try {
+                return (String)obj;
+            }
+            catch (InvalidCastException) {
+                throw new InvalidOperationException(Environment.GetResourceString("InvalidOperation_ResourceNotString_Name", name));
+            }
+        }
+
+        public virtual String GetString(String name, bool ignoreCase)
+        {
+            Object obj;
+            String s;
+
+            // Case-sensitive lookup
+            obj = GetObjectInternal(name);
+            try {
+                s = (String)obj;
+            }
+            catch (InvalidCastException) {
+                throw new InvalidOperationException(Environment.GetResourceString("InvalidOperation_ResourceNotString_Name", name));
+            }
+
+            // case-sensitive lookup succeeded
+            if (s != null || !ignoreCase) {
+                return s;
+                }
+
+            // Try doing a case-insensitive lookup
+            obj = GetCaseInsensitiveObjectInternal(name);
+            try {
+                return (String)obj;
+            }
+            catch (InvalidCastException) {
+                throw new InvalidOperationException(Environment.GetResourceString("InvalidOperation_ResourceNotString_Name", name));
+            }
+        }
+        
+        // Look up an object value for a resource given its name.
+        // 
+        public virtual Object GetObject(String name)
+        {
+            return GetObjectInternal(name);
+        }
+
+        public virtual Object GetObject(String name, bool ignoreCase)
+        {
+            Object obj = GetObjectInternal(name);
+            
+            if (obj != null || !ignoreCase)
+                return obj;
+
+            return GetCaseInsensitiveObjectInternal(name);
+        }
+    
+        protected virtual void ReadResources()
+        {
+            IDictionaryEnumerator en = Reader.GetEnumerator();
+            while (en.MoveNext()) {
+                Object value = en.Value;
+#if LOOSELY_LINKED_RESOURCE_REFERENCE
+                if (Assembly != null && value is LooselyLinkedResourceReference) {
+                    LooselyLinkedResourceReference assRef = (LooselyLinkedResourceReference) value;
+                    value = assRef.Resolve(Assembly);
+                }
+#endif //LOOSELYLINKEDRESOURCEREFERENCE
+                Table.Add(en.Key, value);
+            }
+            // While technically possible to close the Reader here, don't close it
+            // to help with some WinRes lifetime issues.
+        }
+
+        private Object GetObjectInternal(String name)
+        {
+            if (name == null)
+                throw new ArgumentNullException("name");
+            Contract.EndContractBlock();
+
+            Hashtable copyOfTable = Table;  // Avoid a race with Dispose
+
+            if (copyOfTable == null)
+                throw new ObjectDisposedException(null, Environment.GetResourceString("ObjectDisposed_ResourceSet"));
+
+            return copyOfTable[name];
+        }
+
+        private Object GetCaseInsensitiveObjectInternal(String name)
+        {
+            Hashtable copyOfTable = Table;  // Avoid a race with Dispose
+
+            if (copyOfTable == null)
+                throw new ObjectDisposedException(null, Environment.GetResourceString("ObjectDisposed_ResourceSet"));
+
+            Hashtable caseTable = _caseInsensitiveTable;  // Avoid a race condition with Close
+            if (caseTable == null)
+            {
+                caseTable = new Hashtable(StringComparer.OrdinalIgnoreCase);
+#if _DEBUG
+                //Console.WriteLine("ResourceSet::GetObject loading up case-insensitive data");
+                BCLDebug.Perf(false, "Using case-insensitive lookups is bad perf-wise.  Consider capitalizing "+name+" correctly in your source");
+#endif
+
+                IDictionaryEnumerator en = copyOfTable.GetEnumerator();
+                while (en.MoveNext())
+                {
+                    caseTable.Add(en.Key, en.Value);
+                }
+                _caseInsensitiveTable = caseTable;
+            }
+
+            return caseTable[name];
+        }
+    }
+}