using System;

using System.IO;

using System.IO.Compression;

using System.Text;

public class Program

{

    public static void Main()

    {

        var compressedText = "nQAAAB+LCAAAAAAAAAM1jTEKwzAMRXeDj5Klu6dCxlwhyJYIhlgCWS7k9lXdZPp67/MRqYruRZDS8oqBJjbqHQ5K79FNGukmtspgjKG42SumGDKcwIXS7U45Kj/A0GZR7fqFT03nNVSJy/X/FwOCgUcfOSswPnP4uFenL8vD64KdAAAA";

        byte[] gZipBuffer = Convert.FromBase64String(compressedText);

        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);

            }

​

            Console.WriteLine(Encoding.UTF8.GetString(buffer));

        }

    }

}