图片二进制存入ORACLE和写出

using System;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.IO;
using System.Data.OracleClient;
public partial class _Default : System.Web.UI.Page
{
    WebService web = new WebService();
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
        
            GridView1.DataSource = web.UpLoad();
            GridView1.DataBind();
        }
    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        Stream imgdatastream = FileUpload1.PostedFile.InputStream;
        int imgleng = FileUpload1.PostedFile.ContentLength;
        string name = FileUpload1.FileName;
        byte[] imgdata = new byte[imgleng];
        if (web.UP(name,imgdata,imgleng))
        {
            GridView1.DataSource = web.UpLoad();
            GridView1.DataBind();
        }
    }
    protected void LinkButton1_Click(object sender, EventArgs e)
    {
        LinkButton linkbtn = sender as LinkButton;