private byte[] FileContent(string fileName)
        {
            using (FileStream fs = new FileStream(fileName, FileMode.Open, FileAccess.Read))
            {
                try
                {
                    byte[] buffur = new byte[fs.Length];
                    fs.Read(buffur, 0, (int)fs.Length);
                    return buffur;
                }
                catch (Exception ex)
                {
                    throw ex;
                }
            }
        }