string sql2 = "Update [Employee] set photo=@photo where workNo='" + emp.WorkNo + "'";

  /// <summary>    
        /// 向数据库里插入图像格式的字段(和上面情况类似的另一种实例)    
        /// </summary>    
        /// <param name="strSQL">SQL语句</param>    
        /// <param name="fs">图像字节,数据库的字段类型为image的情况</param>    
        /// <returns>影响的记录数</returns>    
        public static int Execute(string SqlStr, byte[] photo)
        {
            OleDbCommand cmd = new OleDbCommand(SqlStr, Conn);
            OleDbParameter myParameter = new OleDbParameter("@photo", SqlDbType.Image);
            myParameter.Value = photo;
            cmd.Parameters.Add(myParameter);
            int result = cmd.ExecuteNonQuery();
            return result;
        }


    if (dt.Rows[0]["photo"] != null && dt.Rows[0]["photo"].ToString()!="")
                    {
                        pictureBox1.Image = PictureOpreate.ByteArrayToImage((byte[])dt.Rows[0]["photo"], 1);
                    }

------解决方案--------------------
http://www.cnblogs.com/lujin49/archive/2011/08/06/2129516.html

http://www.cnblogs.com/sufei/archive/2010/09/24/1834054.html

------解决方案--------------------
破论坛！怎么不显示啊。。。

http://www.cnblogs.com/lujin49/archive/2011/08/06/2129516.html

http://www.cnblogs.com/sufei/archive/2010/09/24/1834054.html