1 files changed, 0 insertions, 46 deletions
diff --git a/src/mscorlib/src/System/IO/StreamHelpers.CopyValidation.cs b/src/mscorlib/src/System/IO/StreamHelpers.CopyValidation.cs
deleted file mode 100644
index 8ff0e045ca..0000000000
--- a/src/mscorlib/src/System/IO/StreamHelpers.CopyValidation.cs
+++ /dev/null
@@ -1,46 +0,0 @@
-// Licensed to the .NET Foundation under one or more agreements.
-// The .NET Foundation licenses this file to you under the MIT license.
-// See the LICENSE file in the project root for more information.
-
-namespace System.IO
-{
-    /// <summary>Provides methods to help in the implementation of Stream-derived types.</summary>
-    internal static partial class StreamHelpers
-    {
-        /// <summary>Validate the arguments to CopyTo, as would Stream.CopyTo.</summary>
-        public static void ValidateCopyToArgs(Stream source, Stream destination, int bufferSize)
-        {
-            if (destination == null)
-            {
-                throw new ArgumentNullException(nameof(destination));
-            }
-
-            if (bufferSize <= 0)
-            {
-                throw new ArgumentOutOfRangeException(nameof(bufferSize), bufferSize, Environment.GetResourceString("ArgumentOutOfRange_NeedPosNum"));
-            }
-
-            bool sourceCanRead = source.CanRead;
-            if (!sourceCanRead && !source.CanWrite)
-            {
-                throw new ObjectDisposedException(null, Environment.GetResourceString("ObjectDisposed_StreamClosed"));
-            }
-
-            bool destinationCanWrite = destination.CanWrite;
-            if (!destinationCanWrite && !destination.CanRead)
-            {
-                throw new ObjectDisposedException(nameof(destination), Environment.GetResourceString("ObjectDisposed_StreamClosed"));
-            }
-
-            if (!sourceCanRead)
-            {
-                throw new NotSupportedException(Environment.GetResourceString("NotSupported_UnreadableStream"));
-            }
-
-            if (!destinationCanWrite)
-            {
-                throw new NotSupportedException(Environment.GetResourceString("NotSupported_UnwritableStream"));
-            }
-        }
-    }
-}