c#写的图片上传代码

using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.Data.SqlClient;
using System.Text;



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

    protected void Button3_Click1(object sender, EventArgs e)
    {
        if (myFile.HasFile)
        {

            string strFileName = myFile.PostedFile.FileName;

            string strFileExt = System.IO.Path.GetExtension(strFileName);

            if (strFileExt.ToLower() == ".jpeg" || strFileExt.ToLower() == ".bmp" || strFileExt.ToLower() == ".jpg" || strFileExt.ToLower() == ".gif" || strFileExt.ToLower() == ".png")
            {
                string strFileNewName = DateTime.Now.ToString("yyyyMMddhhmmss") + strFileExt;

                //string strFileDownloadPath=strUrl.Substring(0,strUrl.LastIndexOf('/'))+'/'+strFileNewName;
                int iFileSize = myFile.PostedFile.ContentLength;
                myFile.SaveAs(Server.MapPath("../imageUpload/txzp/" + strFileNewName));//生成图片

                this.MakeThumbnail(Server.MapPath("../imageUpload/txzp/" + strFileNewName), Server.MapPath

        ("../imageUpload/txslt/" + strFileNewName), 140, 160, "Cut", strFileExt); //生成缩略图
                Session["FileNewName"] = strFileNewName.ToString();
                Response.Write("照片上传成功");
               

            }
            else
            {
                Response.Write("系统只能接受jpeg,bmp,jpg,gif,png的文件");
            }
        }
        else
        {
            Response.Write("请选择您要上传的文件");
        }
    }