前台代码：

<asp:FileUpload ID="FileUpload" runat="server" />  

< asp:Button ID="BtnUp" runat="server" onclick="BtnUp_Click" Text="上 传" />  

< asp:Label ID="LabMsg" runat="server"></asp:Label>


后台代码：

using System;  

using System.Collections.Generic;  

using System.Web;  

using System.Web.UI;  

using System.Web.UI.WebControls;  

  

namespace docnet  

{  

    public partial class up : System.Web.UI.Page  

    {  

        protected void Page_Load(object sender, EventArgs e)  

        {  

  

        }  

  

        protected void BtnUp_Click(object sender, EventArgs e)  

        {  

            if (FileUpload.HasFile)  

            {  

                string savePath = Server.MapPath("~/upload/");//指定上传文件在服务器上的保存路径  

                //检查服务器上是否存在这个物理路径，如果不存在则创建  

                if (!System.IO.Directory.Exists(savePath))  

                {  

                    System.IO.Directory.CreateDirectory(savePath);  

                }  

                savePath = savePath + "\\" + FileUpload.FileName;  

                FileUpload.SaveAs(savePath);  

                LabMsg.Text = string.Format("<a href='upload/{0}'>upload/{0}</a>", FileUpload.FileName);  

            }  

            else

            {  

                LabMsg.Text = "你还没有选择上传文件!";  

            }  

        }  

    }  

}