在做一个信息管理平台时用到了图片，就像做一个上传的
  正好用的是asp.Net AJAX
  就试着做了一个
  不很好
  
  自定义用户控件文件 PicUpload.ascx
  
  1<%@ control language="C#" autoeventwireup="true" inherits="Admin_PicUpload, App_Web_mboefw14" %>
  2 <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="上传" />
  自定义用户控件文件 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 //获取根文件绝对路径
  22 string path = Server.MapPath("~/UpLoad/");
  23 //如上传了文件，就判断文件格式
  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 //调用saveas方法，实现上传文件
  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 = "上传成功";
  45 }
  46 finally
  47 {
  48 }
  49 }
  50 else
  51 {
  52 Button1.Text = "上传失败，格式不允许";
  53 }
  54 }
  55}
  56
  
  逐步完成...