Dotnet string / text compression and decompression extension

StringCompressionExtension.cs

public static class StringCompressionExtension
    {
        /// <summary>
        /// Compresses the string to bytes array.
        /// </summary>
        /// <param name="text">The text.</param>
        /// <returns></returns>
        public static byte[] Compress(this string text)
        {
            byte[] buffer = Encoding.UTF8.GetBytes(text);
            var memoryStream = new MemoryStream();
            using (var gZipStream = new GZipStream(memoryStream, CompressionMode.Compress, true))
            {
                gZipStream.Write(buffer, 0, buffer.Length);
            }

            memoryStream.Position = 0;

            var compressedData = new byte[memoryStream.Length];
            memoryStream.Read(compressedData, 0, compressedData.Length);

            var gZipBuffer = new byte[compressedData.Length + 4];
            Buffer.BlockCopy(compressedData, 0, gZipBuffer, 4, compressedData.Length);
            Buffer.BlockCopy(BitConverter.GetBytes(buffer.Length), 0, gZipBuffer, 0, 4);
            return gZipBuffer;
        }

        /// <summary>
        /// Decompresses the string from bytes array.
        /// </summary>
        /// <param name="encodedBytes"></param>
        /// <returns></returns>
        public static string Decompress(this byte[] encodedBytes)
        {
            byte[] gZipBuffer = encodedBytes;
            using (var memoryStream = new MemoryStream())
            {
                int dataLength = BitConverter.ToInt32(gZipBuffer, 0);
                memoryStream.Write(gZipBuffer, 4, gZipBuffer.Length - 4);

                var buffer = new byte[dataLength];

                memoryStream.Position = 0;
                using (var gZipStream = new GZipStream(memoryStream, CompressionMode.Decompress))
                {
                    gZipStream.Read(buffer, 0, buffer.Length);
                }

                return Encoding.UTF8.GetString(buffer);
            }
        }
    }

How to use?

string myText = "hello world";
byte[] compressedBytes = myText.Compress();
string decompressedText = compressedBytes.Decompress();