protected void Decompress(string filePath,string fileout)
        {
            FileStream sourceFile = File.OpenRead(filePath);
            FileStream destinationFile = File.Create(fileout);
            GZipStream unzip = null;
            byte[] buffer = new byte[sourceFile.Length];
            try
            {
                unzip = new GZipStream(sourceFile, CompressionMode.Decompress, false);
                int numberOfBytes = unzip.Read(buffer, 0, buffer.Length);
 
                destinationFile.Write(buffer, 0, numberOfBytes);
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
            finally
            {
                sourceFile.Close();
                destinationFile.Close();
                unzip.Close();
            }
        }