在做一個信息管理平臺時用到了圖片，就像做一個上傳的
正好用的是asp.net Ajax
就試著做了一個
不很好

自定義用戶控件文件 PicUpload.ascx

1<%@ control language="C#" autoeventwireup="true" inherits="Admin_PicUpload, App_Web_mboefw14" %>
2&nbsp;<asp:Image ID="EP_Image" runat="server" Height="160px" ImageUrl='<%# Bind("EP_Pic") %>'
3    Width="314px" />
4<br />
5<asp:FileUpload ID="FileUpload1" runat="server" />
6<asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="上傳" />
自定義用戶控件文件 PicUpload.ascx.cs

 1using System;
 2using System.Data;
 3using System.Configuration;
 4using System.Collections;
 5using System.Web;
 6using System.Web.Security;
 7using System.Web.UI;
 8using System.Web.UI.WebControls;
 9using System.Web.UI.WebControls.WebParts;
10using System.Web.UI.HtmlControls;
11
12public partial class Admin_PicUpload : System.Web.UI.UserControl
13{
14    PRotected void Page_Load(object sender, EventArgs e)
15    {
16
17    }
18    protected void Button1_Click(object sender, EventArgs e)
19    {
20        bool fileOK = false;
21        //獲取根文件絕對路徑
22        string path = Server.MapPath("~/UpLoad/");
23        //如上傳了文件，就判斷文件格式
24        FileUpload FU = FileUpload1;
25        if (FU.HasFile)
26        {
27            string fileExtension = System.IO.Path.GetExtension(FU.FileName).ToLower();
28            string[] allowedExtensions ={ ".gif", ".jpg", ".png", ".bmp", };
29            for (int i = 0; i < allowedExtensions.Length; i++)
30            {
31                if (fileExtension == allowedExtensions[i])
32                {
33                    fileOK = true;
34                }
35            }
36        }
37        //調用saveas方法，實現上傳文件
38        if (fileOK)
39        {
40            try
41            {
42                FileUpload1.SaveAs(path + System.DateTime.Now.ToString("yyyyMMddhhmmss")+FU.FileName);
43                EP_Image.ImageUrl = "../Upload/" + System.DateTime.Now.ToString("yyyyMMddhhmmss") + FU.FileName;
44                Button1.Text = "上傳成功";
45            }
46            finally
47            {
48            }
49        }
50        else
51        {
52            Button1.Text = "上傳失敗，格式不允許";
53        }
54    }
55}
56

逐步完成...
http://www.companysz.com/zhiyyang/archive/2006/12/11/589020.html