asp.net2.0 FileUpload控件

using System;
using System.Data;
using System.Configuration;
using System.Collections;
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 business_uploadimg : System.Web.UI.Page
{
    public string filepath = "";
    public int count = 1;
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!Page.IsPostBack)
        {
            HideControls();
            this.firstdel.Attributes.Add("onclick", "return confirm('确认要删除第一张产品图片吗？')");
            this.seconddel.Attributes.Add("onclick", "return confirm('确认要删除第二张产品图片吗？')");
            this.thirddel.Attributes.Add("onclick", "return confirm('确认要删除第三张产品图片吗？')");
        }
    }

    public void HideControls()
    {
        firstupload.Visible = false;
        secondupload.Visible = false;
        thirdupload.Visible = false;
    }
    protected void ImageButton2_Click(object sender, ImageClickEventArgs e)
    {
        string fullfile = FileUpload1.PostedFile.FileName; //获取客户端上的文件的完全限定名称
        string imgtype = FileUpload1.PostedFile.ContentType; //获取客户端发送的文件的MIME内容类型
        int imgsize = FileUpload1.PostedFile.ContentLength; //获取上载文件的大小(以字节为单位)
        string extension = Path.GetExtension(fullfile).ToLower();//
        if (fullfile == "" || fullfile == null)
        {
            Ahcom.Base.MessageObject.ShowMessage(this, "请选择一张产品图片再上传！");
            return;
        }
        else if (extension != ".jpg" && extension != ".jpeg" && extension != ".gif")
        {
            Ahcom.Base.MessageObject.ShowMessage(this, "请您选择一个有效的文件上传！http://www.cnblogs.com/juan/admin/file://n/支持的图片格式有（.jpg|.jpeg|.gif），http://www.cnblogs.com/juan/admin/file://n/请您转换图片格式后重新上传！");
            return;
        }
        else if (imgsize <= 0)
        {
            Ahcom.Base.MessageObject.ShowMessage(this, "上传的图片太小，http://www.cnblogs.com/juan/admin/file://n/ 请您选择一张清晰的图片后重新上传！");
            return;
        }
        else if (imgsize > 2048*1024)
        {
            Ahcom.Base.MessageObject.ShowMessage(this, "您上传的图片总大小超出的最大限制了（2MB）！");
            return;
        }
        else
        {
            try
            {

                string filename = System.DateTime.Now.Year.ToString() + System.DateTime.Now.Month.ToString() + System.DateTime.Now.Day.ToString() + System.DateTime.Now.Hour.ToString() + System.DateTime.Now.Minute.ToString() + System.DateTime.Now.Second.ToString() + System.DateTime.Now.Millisecond.ToString();
                filename += extension;
                HiddenField1.Value = filename;
                Session["ImageFile1"] = filename;
                string path = Server.MapPath("../UpLoadFiels/ProductPic/");
                filepath = path + filename;
                try
                {
                    this.FileUpload1.PostedFile.SaveAs(filepath);
                   
                }
                catch (Exception error)
                {
                    Ahcom.Base.MessageObject.ShowMessage(this, "您上传的磁盘没有写入权限，请您设置可写权限！ http://www.cnblogs.com/juan/admin/file://n/错误原因：" + error.Message + "");
                    return;
                }

                if (extension == ".gif" || extension == ".jpg" || extension == ".jpeg")
                {
                    firstimg.Height = 100;
                    firstimg.Width = 100;
                    firstimg.ImageAlign = ImageAlign.AbsMiddle;
                    firstimg.ImageUrl = "../UpLoadFiels/ProductPic/" + filename;
                    HideControls();
                }
                else
                {
                    firstimg.Height = 100;
                    firstimg.Width = 100;
                    firstimg.ImageAlign = ImageAlign.AbsMiddle;
                    firstimg.ImageUrl = "~/images/index/detail_no_pic.gif";
                }

            }
            catch (Exception ex)
            {
                Ahcom.Base.MessageObject.ShowMessage(this, "上传图片失败！http://www.cnblogs.com/juan/admin/file://n/错误原因：" + ex.Message + "");
                return;
            }
        }
    }
    protected void firstdel_Click(object sender, EventArgs e)
    {
        if (System.IO.File.Exists(Server.MapPath("../UpLoadFiels/ProductPic/") + HiddenField1.Value) == true)
        {
            try
            {
                File.Delete(Server.MapPath("../UpLoadFiels/ProductPic/") + HiddenField1.Value);
                firstimg.Height = 100;
                firstimg.Width = 100;
                firstimg.ImageAlign = ImageAlign.AbsMiddle;
                firstimg.ImageUrl = "~/images/index/detail_no_pic.gif";
                count = 1;
                firstupload.Visible = true;
                secondupload.Visible = false;
                thirdupload.Visible = false;
            }
            catch(Exception ex)
            {
                Ahcom.Base.MessageObject.ShowMessage(this, "删除图片失败，失败原因："+ex.Message);
                return;
            }
        }
        else
        {
            Ahcom.Base.MessageObject.ShowMessage(this, "删除的图片文件不存在！");
            firstimg.Height = 100;
            firstimg.Width = 100;
            firstimg.ImageAlign = ImageAlign.AbsMiddle;
            firstimg.ImageUrl = "~/images/index/detail_no_pic.gif";
        }
  
    }
    protected void firstup_Click(object sender, EventArgs e)
    {
        count = 1;
        firstupload.Visible = true;
        secondupload.Visible = false;
        thirdupload.Visible = false;
    }
    protected void btnsecondup_Click(object sender, EventArgs e)
    {
        count = 2;
        firstupload.Visible = false;
        secondupload.Visible = true;
        thirdupload.Visible = false;
    }
    protected void btnthirdup_Click(object sender, EventArgs e)
    {
        count = 3;
        firstupload.Visible = false;
        secondupload.Visible = false;
        thirdupload.Visible = true;
    }
    protected void ImageButton1_Click(object sender, ImageClickEventArgs e)
    {
        string fullfile = FileUpload2.PostedFile.FileName; //获取客户端上的文件的完全限定名称
        string imgtype = FileUpload2.PostedFile.ContentType; //获取客户端发送的文件的MIME内容类型
        int imgsize = FileUpload2.PostedFile.ContentLength; //获取上载文件的大小(以字节为单位)
        string extension = Path.GetExtension(fullfile).ToLower();//
        if (fullfile == "" || fullfile == null)
        {
            Ahcom.Base.MessageObject.ShowMessage(this, "请选择一张产品图片再上传！");
            return;
        }
        else if (extension != ".jpg" && extension != ".jpeg" && extension != ".gif")
        {
            Ahcom.Base.MessageObject.ShowMessage(this, "请您选择一个有效的文件上传！http://www.cnblogs.com/juan/admin/file://n/支持的图片格式有（.jpg|.jpeg|.gif），http://www.cnblogs.com/juan/admin/file://n/请您转换图片格式后重新上传！");
            return;
        }
        else if (imgsize <= 0)
        {
            Ahcom.Base.MessageObject.ShowMessage(this, "上传的图片太小，http://www.cnblogs.com/juan/admin/file://n/ 请您选择一张清晰的图片后重新上传！");
            return;
        }
        else if (imgsize > 2048*1024)
        {
            Ahcom.Base.MessageObject.ShowMessage(this, "您上传的图片总大小超出的最大限制了（2MB）！");
            return;
        }
        else
        {
            try
            {

                string filename = System.DateTime.Now.Year.ToString() + System.DateTime.Now.Month.ToString() + System.DateTime.Now.Day.ToString() + System.DateTime.Now.Hour.ToString() + System.DateTime.Now.Minute.ToString() + System.DateTime.Now.Second.ToString() + System.DateTime.Now.Millisecond.ToString();
                filename += extension;
                HiddenField2.Value = filename;
                Session["ImageFile"] = filename;
                string path = Server.MapPath("../UpLoadFiels/ProductPic/");
                filepath = path + filename;
                try
                {
                    this.FileUpload2.PostedFile.SaveAs(filepath);
                }
                catch (Exception err)
                {
                    Ahcom.Base.MessageObject.ShowMessage(this, "您上传的磁盘没有写入权限，请您设置可写权限！ http://www.cnblogs.com/juan/admin/file://n/错误原因：" + err.Message + "");
                    return;
                }

                if (extension == ".gif" || extension == ".jpg" || extension == ".jpeg")
                {
                    secondimg.Height = 100;
                    secondimg.Width = 100;
                    secondimg.ImageAlign = ImageAlign.AbsMiddle;
                    secondimg.ImageUrl = "../UpLoadFiels/ProductPic/" + filename;
                    HideControls();
                }
                else
                {
                    secondimg.Height = 100;
                    secondimg.Width = 100;
                    secondimg.ImageAlign = ImageAlign.AbsMiddle;
                    secondimg.ImageUrl = "~/images/index/detail_no_pic.gif";
                }

            }
            catch (Exception ex)
            {
                Ahcom.Base.MessageObject.ShowMessage(this, "上传图片失败！http://www.cnblogs.com/juan/admin/file://n/错误原因：" + ex.Message + "");
                return;
            }
        }

    }
    protected void ImageButton3_Click(object sender, ImageClickEventArgs e)
    {
        string fullfile = FileUpload3.PostedFile.FileName; //获取客户端上的文件的完全限定名称
        string imgtype = FileUpload3.PostedFile.ContentType; //获取客户端发送的文件的MIME内容类型
        int imgsize = FileUpload3.PostedFile.ContentLength; //获取上载文件的大小(以字节为单位)
        string extension = Path.GetExtension(fullfile).ToLower();//
        if (fullfile == "" || fullfile == null)
        {
            Ahcom.Base.MessageObject.ShowMessage(this, "请选择一张产品图片再上传！");
            return;
        }
        else if (extension != ".jpg" && extension != ".jpeg" && extension != ".gif")
        {
            Ahcom.Base.MessageObject.ShowMessage(this, "请您选择一个有效的文件上传！http://www.cnblogs.com/juan/admin/file://n/支持的图片格式有（.jpg|.jpeg|.gif），http://www.cnblogs.com/juan/admin/file://n/请您转换图片格式后重新上传！");
            return;
        }
        else if (imgsize <= 0)
        {
            Ahcom.Base.MessageObject.ShowMessage(this, "上传的图片太小，http://www.cnblogs.com/juan/admin/file://n/ 请您选择一张清晰的图片后重新上传！");
            return;
        }
        else if (imgsize > 2048*1024)
        {
            Ahcom.Base.MessageObject.ShowMessage(this, "您上传的图片总大小超出的最大限制了（2MB）！");
            return;
        }
        else
        {
            try
            {

                string filename = System.DateTime.Now.Year.ToString() + System.DateTime.Now.Month.ToString() + System.DateTime.Now.Day.ToString() + System.DateTime.Now.Hour.ToString() + System.DateTime.Now.Minute.ToString() + System.DateTime.Now.Second.ToString() + System.DateTime.Now.Millisecond.ToString();
                filename += extension;
                HiddenField3.Value = filename;
                Session["ImageFile3"] = filename;
                string path = Server.MapPath("../UpLoadFiels/ProductPic/");
                filepath = path + filename;
                try
                {
                    this.FileUpload3.PostedFile.SaveAs(filepath);
                }
                catch (Exception errmsg)
                {
                    Ahcom.Base.MessageObject.ShowMessage(this, "您上传的磁盘没有写入权限，请您设置可写权限！http://www.cnblogs.com/juan/admin/file://n/错误原因： " + errmsg.Message + "");
                    return;
                }

                if (extension == ".gif" || extension == ".jpg" || extension == ".jpeg")
                {
                    thirdimg.Height = 100;
                    thirdimg.Width = 100;
                    thirdimg.ImageAlign = ImageAlign.AbsMiddle;
                    thirdimg.ImageUrl = "../UpLoadFiels/ProductPic/" + filename;
                    HideControls();
                }
                else
                {
                    thirdimg.Height = 100;
                    thirdimg.Width = 100;
                    thirdimg.ImageAlign = ImageAlign.AbsMiddle;
                    thirdimg.ImageUrl = "~/images/index/detail_no_pic.gif";
                }

            }
            catch (Exception ex)
            {
                Ahcom.Base.MessageObject.ShowMessage(this, "上传图片失败！http://www.cnblogs.com/juan/admin/file://n/错误原因：" + ex.Message + "");
                return;
            }
        }

    }
    protected void seconddel_Click(object sender, EventArgs e)
    {
        if (System.IO.File.Exists(Server.MapPath("../UpLoadFiels/ProductPic/") + HiddenField2.Value) == true)
        {
            try
            {
                File.Delete(Server.MapPath("../UpLoadFiels/ProductPic/") + HiddenField2.Value);
                secondimg.Height = 100;
                secondimg.Width = 100;
                secondimg.ImageAlign = ImageAlign.AbsMiddle;
                secondimg.ImageUrl = "~/images/index/detail_no_pic.gif";
                count = 2;
                firstupload.Visible = false;
                secondupload.Visible = true;
                thirdupload.Visible = false;
            }
            catch (Exception ex)
            {
                Ahcom.Base.MessageObject.ShowMessage(this, "删除图片失败，失败原因：" + ex.Message);
                return;
            }
        }
        else
        {
            Ahcom.Base.MessageObject.ShowMessage(this, "删除的图片文件不存在！");
            secondimg.Height = 100;
            secondimg.Width = 100;
            secondimg.ImageAlign = ImageAlign.AbsMiddle;
            secondimg.ImageUrl = "~/images/index/detail_no_pic.gif";
        }

    }
    protected void thirddel_Click(object sender, EventArgs e)
    {
        if (System.IO.File.Exists(Server.MapPath("../UpLoadFiels/ProductPic/") + HiddenField3.Value) == true)
        {
            try
            {
                File.Delete(Server.MapPath("../UpLoadFiels/ProductPic/") + HiddenField3.Value);
                thirdimg.Height = 100;
                thirdimg.Width = 100;
                thirdimg.ImageAlign = ImageAlign.AbsMiddle;
                thirdimg.ImageUrl = "~/images/index/detail_no_pic.gif";
                count = 3;
                firstupload.Visible = false;
                secondupload.Visible = false;
                thirdupload.Visible = true;
            }
            catch (Exception ex)
            {
                Ahcom.Base.MessageObject.ShowMessage(this, "删除图片失败，失败原因：" + ex.Message);
                return;
            }
        }
        else
        {
            Ahcom.Base.MessageObject.ShowMessage(this, "删除的图片文件不存在！");
            thirdimg.Height = 100;
            thirdimg.Width = 100;
            thirdimg.ImageAlign = ImageAlign.AbsMiddle;
            thirdimg.ImageUrl = "~/images/index/detail_no_pic.gif";
        }
    }
}