怎么实现把数据库里的图片通过编辑的形式显示出来（代码如下高手来帮帮忙）

前台代码
：
<%@ Page Language="C#" AutoEventWireup="true" Debug ="true" CodeFile="Edit.aspx.cs" Inherits="admin_Edit" validateRequest="false" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
    <title>报名</title>
    <link href="css.css" rel="stylesheet" type="text/css" />
<%--   <link href="Adminstyle.css"  rel="stylesheet" type="text/css" />--%>
</head>
<body style="margin-top: 0px; padding-top: 0px">
    <form id="form1" runat="server">
    
        <div>&nbsp;&nbsp;
            <table  border="0" cellpadding="0" cellspacing="1"
                 height="100" style="width: 95%">
                <tr>
                    <td bgcolor="#d1e7fc" style="height: 22px; " align="center">
                        <div align="center" style="font-size: 20pt">
                            信息编辑</div>
                    </td>
                </tr>
                <tr>
                    <td align="left"  valign="top" style="height: 420px;  ">
                        &nbsp;<table style="  height: 100px; width: 100%; vertical-align: middle; direction: ltr; text-align: left;" border ="0">
            <tr>
                <td style=" border-bottom: 1px solid; width: 107px;"   align="right">
                    学 员:</td>
                <td style="  border-bottom: 1px solid;  width: 1100px;">
                    <asp:TextBox ID="txtname" runat="server" CssClass="txt" MaxLength="15" Width="225px"></asp:TextBox>&nbsp;</td>
            </tr>
            <tr style="color: #000000">
                <td style="  border-bottom: 1px solid; width: 107px;" align="right">
                    身份证号:</td>
                <td style=" border-bottom: 1px solid; width: 1100px;">
                    <asp:TextBox ID="txtcard" runat="server" Width="226px"></asp:TextBox></td>
            </tr>
                            <tr style="color: #000000">
                                <td style="  border-bottom: 1px solid; width: 107px;" align="right">
                                    单位:</td>
                                <td style="  border-bottom: 1px solid; width:1100px;">
                                    <asp:TextBox ID="txtunit" runat="server" Width="225px"></asp:TextBox></td>
                            </tr>
                            <tr style="color: #000000">
                                <td style="  border-bottom: 1px solid; width: 107px;" align="right">
                                    职业:</td>
                                <td style=" border-bottom: 1px solid; width:1100px;">
                                    <asp:TextBox ID="txtwork" runat="server" Width="226px"  ></asp:TextBox></td>
                            </tr>
            <tr>
                <td style="  height: 26px; width: 107px;" align="right">
                </td>
                <td align="center" style="  height: 26px; width: 216px;">
                    <asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="保　存" Width="66px" />
                    <asp:Button ID="Button2" runat="server" CausesValidation="False" OnClick="Button2_Click"
                        Text="重　置" /></td>
            </tr>
        </table>
                        <asp:Image ID="Image1" runat="server" /></td>
                </tr>
            </table>
        </div>
    </form>
</body>
</html>
  后台代码：using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;public partial class admin_Edit : System.Web.UI.Page
{
    BaseClass bc = new BaseClass();
   
    protected void Page_Load(object sender, EventArgs e)
    {
         
        if (!IsPostBack)
        {
 
            DataSet ds = bc.GetDataSet("select * from login where uid='" + Request.QueryString["id"] + "'", "login");//获取列表页面的数据ID
            DataRow[] row = ds.Tables[0].Select();
            foreach (DataRow rs in row)
            {                txtname.Text = rs["Uname"].ToString();
                txtcard.Text = rs["UcardId"].ToString();
                txtunit.Text = rs["Uunit"].ToString();
                txtwork.Text = rs["Ucategory"].ToString();
            }
            
         }
    }  
      protected void Button1_Click(object sender, EventArgs e)
    {
            try
    {
        string sql = "UPDATE login SET Uname = '" + txtname.Text +
            "', UcardId = '" + txtcard.Text + "', Uunit = '" + txtunit.Text + "', Ucategory = '" + txtwork.Text + "' WHERE (UID = '" + Request.QueryString["id"] + "')";
       
              bc.ExecSQL(sql);
                         Response.Write(bc.MessageBox("数据修改成功！"));
             Response.Write("<script>location='stulist.aspx'</script>");
        }
        catch
        {
            Response.Write("<script language=javascript>alert('很遗憾！信息更新失败！')</script>");
        }
     }
    protected void Button2_Click(object sender, EventArgs e)
    {
        txtname.Text = "";
        txtcard.Text = "";
        txtunit.Text = "";
        txtwork.Text = "";
    }
}