从数据库读取图片

protected   void  Page_Load( object  sender, EventArgs e)
     ... {
        if (!this.IsPostBack)
        ...{
            int id = Convert.ToInt32(Request.QueryString["id"]);
            try
            ...{
                DataSet ds = Service.SelServiceid(id);
                DataRow dr;
                dr = ds.Tables[0].Rows[0];
                byte[] pic = new byte[0];
                if (dr["Request_Image"].ToString() != "")
                ...{
                    pic = (byte[])dr["Request_Image"];
                }
                /**//图片输出格式
                Response.ContentType = dr["Request_type"].ToString();
                /**///图片Byte数组
                Response.BinaryWrite(pic);
            }
            catch (Exception ex)
            ...{
                string error = ex.Message;
            }
        }
    }