C# GZ Uncompression

/// <summary>
        /// Uncompresses a gz file.
        /// </summary>
        /// <param name="filePath">The file path.</param>
        /// <param name="memStream">The memory stream.</param>
        void UncompressGzFile(string filePath, ref MemoryStream memStream) {
            using (var fStream = new FileStream(filePath, FileMode.Open))
            using (var zipStream = new GZipStream(fStream, CompressionMode.Decompress, false)) {
                zipStream.CopyTo(memStream = new MemoryStream());
                memStream.Position = 0; // Set position to beginning to prevent weird errors from happening throughout the application.
            }
        }