上传图片

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>

<!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>无标题页</title>
</head>
<body>
    <form id="form1" runat="server" enctype="multipart/form-data">
    <div>
        <input id="input_image" type="file" runat="server" />
        <asp:Button ID="btn_upload" runat="server" OnClick="btn_upload_Click" Text="upload" /></div>
    </form>
</body>
</html>

using System;
using System.Data;
using System.Configuration;
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.IO;

public partial class _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

     //   string path = this.Server.MapPath("//");
     // string image_name=this.input_image.PostedFile.FileName;
        string new_name = DateTime.Now.ToString("YYYYMMDDHHMMSS");
    }
    protected void btn_upload_Click(object sender, EventArgs e)
    {
        string imgfull_name=this.input_image.PostedFile.FileName;
        string img_name = this.input_image.PostedFile.FileName.Substring(imgfull_name.LastIndexOf("\\")+1);
        string time_name = DateTime.Now.ToString("yyyyMMddHHmmss") + ".jpg";

       // this.input_image.PostedFile.SaveAs(Server.MapPath("upload")+"\\"+img_name);
        this.input_image.PostedFile.SaveAs(Server.MapPath("upload") + "\\" + time_name);


    }
}