diff --git a/Code/Npoi.Core.OpenXml4Net/OPC/Package.cs b/Code/Npoi.Core.OpenXml4Net/OPC/Package.cs
deleted file mode 100644
index 6062648..0000000
--- a/Code/Npoi.Core.OpenXml4Net/OPC/Package.cs
+++ /dev/null
@@ -1,160 +0,0 @@
-//using System;
-//using System.Collections.Generic;
-//using System.Text;
-//using System.IO;
-//using Npoi.Core.OpenXml4Net.Exceptions;
-//using Npoi.Core.OpenXml4Net.OPC.Internal;
-//using Npoi.Core.Util;
-
-//namespace Npoi.Core.OpenXml4Net.OPC
-//{
-//    /**
-//     * @deprecated (name clash with {@link java.lang.Package} use {@link OPCPackage} instead.
-//     *
-//     * @author Julien Chable, CDubet
-//     *
-//     */
-//    public abstract class Package : OPCPackage
-//    {
-//        /**
-//         * Logger.
-//         */
-//        private static POILogger logger = POILogFactory.GetLogger(typeof(Package));
-
-//        /**
-//         * @deprecated use {@link OPCPackage}
-//         */
-//        public Package(PackageAccess access)
-//            : base(access)
-//        {
-//        }
-
-//        /**
-//         * @deprecated use {@link OPCPackage#open(string)}
-//         */
-//        public static Package Open(string path)
-//        {
-//            return Open(path, defaultPackageAccess);
-//        }
-
-//        /**
-//         * @deprecated use {@link OPCPackage#open(string,PackageAccess)}
-//         */
-//        public static Package Open(string path, PackageAccess access)
-//        {
-//            if (path == null || "".Equals(path.Trim())
-//                    || new DirectoryInfo(path).Exists)
-//                throw new ArgumentException("path");
-
-//            Package pack = new ZipPackage(path, access);
-//            if (pack.partList == null && access != PackageAccess.WRITE)
-//            {
-//                pack.GetParts();
-//            }
-//            pack.originalPackagePath = Path.GetFullPath(path);
-//            return pack;
-//        }
-
-//        /**
-//         * @deprecated use {@link OPCPackage#open(InputStream)}
-//         */
-//        public static Package Open(Stream in1)
-//        {
-//            Package pack = new ZipPackage(in1, PackageAccess.READ);
-//            if (pack.partList == null)
-//            {
-//                pack.GetParts();
-//            }
-//            return pack;
-//        }
-
-//        /**
-//         * @deprecated use {@link OPCPackage#openOrCreate(java.io.File)}
-//         */
-//        public static Package OpenOrCreate(string path)
-//        {
-//            Package retPackage = null;
-//            if (File.Exists(path))
-//            {
-//                retPackage = Open(path);
-//            }
-//            else
-//            {
-//                retPackage = Create(path);
-//            }
-//            return retPackage;
-//        }
-
-//        public static Package Create()
-//        {
-//            Stream memStream = new MemoryStream();
-//            return Package.Create(memStream);
-//        }
-//        /**
-//         * @deprecated use {@link OPCPackage#create(File)}
-//         */
-//        public static Package Create(string path)
-//        {
-//            if (new DirectoryInfo(path).Exists)
-//                throw new ArgumentException("path");
-
-//            if (File.Exists(path))
-//            {
-//                throw new InvalidOperationException(
-//                        "This package (or file) already exists : use the open() method or delete the file.");
-//            }
-
-//            // Creates a new package
-//            Package pkg = null;
-//            pkg = new ZipPackage();
-//            pkg.originalPackagePath = Path.GetFullPath(path);
-
-//            ConfigurePackage(pkg);
-//            return pkg;
-//        }
-
-//        /**
-//         * @deprecated use {@link OPCPackage#create(OutputStream)}
-//         */
-//        public static Package Create(Stream output)
-//        {
-//            Package pkg = null;
-//            pkg = new ZipPackage();
-//            pkg.originalPackagePath = null;
-//            pkg.output = output;
-
-//            ConfigurePackage(pkg);
-//            return pkg;
-//        }
-
-//        /**
-//         * Configure the package.
-//         *
-//         * @param pkg
-//         */
-//        private static void ConfigurePackage(Package pkg)
-//        {
-//                // Content type manager
-//                pkg.contentTypeManager = new ZipContentTypeManager(null, pkg);
-//                // Add default content types for .xml and .rels
-//                pkg.contentTypeManager
-//                        .AddContentType(
-//                                PackagingUriHelper
-//                                        .CreatePartName(PackagingUriHelper.PACKAGE_RELATIONSHIPS_ROOT_URI),
-//                                ContentTypes.RELATIONSHIPS_PART);
-//                pkg.contentTypeManager
-//                        .AddContentType(PackagingUriHelper
-//                                .CreatePartName("/default.xml"),
-//                                ContentTypes.PLAIN_OLD_XML);
-
-//                // Init some Package properties
-//                pkg.packageProperties = new PackagePropertiesPart(pkg,
-//                        PackagingUriHelper.CORE_PROPERTIES_PART_NAME);
-//                pkg.packageProperties.SetCreatorProperty("Generated by OpenXml4Net");
-//                pkg.packageProperties.SetCreatedProperty(new Nullable<DateTime>(
-//                        new DateTime()));
-
-//        }
-
-//    }
-//}
\ No newline at end of file
diff --git a/Code/Npoi.Core/Util/Collections/EmptyEnumerable.cs b/Code/Npoi.Core/Util/Collections/EmptyEnumerable.cs
deleted file mode 100644
index fb9d71e..0000000
--- a/Code/Npoi.Core/Util/Collections/EmptyEnumerable.cs
+++ /dev/null
@@ -1,68 +0,0 @@
-/* ====================================================================
-   Licensed to the Apache Software Foundation (ASF) under one or more
-   contributor license agreements.  See the NOTICE file distributed with
-   this work for Additional information regarding copyright ownership.
-   The ASF licenses this file to You under the Apache License, Version 2.0
-   (the "License"); you may not use this file except in compliance with
-   the License.  You may obtain a copy of the License at
-
-       http://www.apache.org/licenses/LICENSE-2.0
-
-   Unless required by applicable law or agreed to in writing, software
-   distributed under the License is distributed on an "AS IS" BASIS,
-   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-   See the License for the specific language governing permissions and
-   limitations under the License.
-==================================================================== */
-
-/* ================================================================
- * About NPOI
- * Author: Tony Qu
- * Author's email: tonyqus (at) gmail.com
- * Author's Blog: tonyqus.wordpress.com.cn (wp.tonyqus.cn)
- * HomePage: http://www.codeplex.com/npoi
- * Contributors:
- *
- * ==============================================================*/
-
-namespace Npoi.Core.Util.Collections
-{
-    //public sealed class EmptyEnumerable
-    //    : IEnumerable
-    //{
-    //    public static readonly IEnumerable Instance = new EmptyEnumerable();
-
-    //    private EmptyEnumerable()
-    //    {
-    //    }
-
-    //    public IEnumerator GetEnumerator()
-    //    {
-    //        return EmptyEnumerator.Instance;
-    //    }
-    //}
-
-    //public sealed class EmptyEnumerator
-    //    : IEnumerator
-    //{
-    //    public static readonly IEnumerator Instance = new EmptyEnumerator();
-
-    //    private EmptyEnumerator()
-    //    {
-    //    }
-
-    //    public bool MoveNext()
-    //    {
-    //        return false;
-    //    }
-
-    //    public void Reset()
-    //    {
-    //    }
-
-    //    public object Current
-    //    {
-    //        get { throw new InvalidOperationException("No elements"); }
-    //    }
-    //}
-}
\ No newline at end of file