List<byte> list = new List<byte>();
            for (int i = 0; i < 5000; i++)
            {
                Random r = new Random(i);
                int dd = r.Next(0, 253);
                list.Add((byte)dd);
            }
            byte[] imageb = list.ToArray();
            MySqlConnection sqlcon = new MySqlConnection("server=192.168.0.2;database=test;port=3306;User Id=root;Connect Timeout=8;password=123456");
            StringBuilder strSql = new StringBuilder();
            strSql.Append("insert into N(");
            strSql.Append("imagexx)");
            strSql.Append(" values (");
            strSql.Append("@imagexx)");
            MySqlCommand sqlcom = new MySqlCommand(strSql.ToString(), sqlcon);
            sqlcom.Parameters.Add("@imagexx", MySqlDbType.Blob, imageb.Length).Value = imageb;
            sqlcon.Open();
            sqlcom.ExecuteNonQuery();
            sqlcom.Dispose();
            sqlcon.Close();
            sqlcon.Dispose();