Uploadfileファイルアップロードコントロールの使用方法

protected void Page_Load(object sender, EventArgs e)
        {
             btnUploadFile2.ServerClick += new EventHandler(btnUploadFile2_ServerClick);
	}

        void btnUploadFile2_ServerClick(object sender, EventArgs e)
        {
            try
            {
                if (TxtMedCode2.Text.Length == 0)
                {
                    Page.RegisterStartupScript("msg", "alert('               !')");
                    return;
                }


                //1.    
                bool fileOK = false;
                string path = Server.MapPath("~/upload/");
                if (this.FileUpload2.HasFile)
                {
                    string fileException = System.IO.Path.GetExtension(FileUpload2.FileName).ToLower();
                    string[] allowedException = { ".jpg", ".gif", ".bmp", ".ico", ".png" };
                    for (int i = 0; i < allowedException.Length; i++)
                    {
                        if (fileException == allowedException[i])
                            fileOK = true;
                    }
                }
                if (fileOK)
                {
                    try
                    {
                        DateTime dt1 = DateTime.Now;

                        //       upload  
                        string strFileName = this.TxtMedCode2.Text.ToString() + dt1.ToString("yyyyMMddHHmmss");
                        this.FileUpload2.SaveAs(path + strFileName + "_Init" + ".jpg");
                        //         ,   image     
                        System.Drawing.Image img_Big = this.PhotoSizeChange(path + strFileName + "_Init" + ".jpg", 300, 165);
                        //       upload  
                        img_Big.Save(path + strFileName + "_Commendation" + ".jpg", System.Drawing.Imaging.ImageFormat.Jpeg);
                        //                      
                        LblImgUrl2.Text = "upload/" + strFileName + "_Commendation" + ".jpg";
                        //

                        if (Mn_PostId(TxtMedCode2.Text) == "0")
                        {
                            //LblDeatil1.Text = "     ,            !";
                        }
                        else
                        {
                            LblPostUrl2.Text = Mn_PostId(TxtMedCode2.Text);
                        }
                        //Img1.ImageUrl = LblImgUrl1.Text.ToString();
                        //       
                        img_Big.Dispose();
                        //this.LblDeatil1.Text = "      !";
                    }
                    catch (Exception ex)
                    {
                        Response.Redirect("~/Error.aspx?error=" + ex.Message.Replace("
", "").Replace("
", ""));
                        Page.RegisterStartupScript("msg", "alert('      ，   !')");
                    }
                }
                else
                {
                    Page.RegisterStartupScript("msg", "alert('     !')");
                }
            }
            catch (Exception e2)
            {
                Response.Redirect("~/Error.aspx?error=" + e2.Message.Replace("
", "").Replace("
", ""));
            }

        }

private System.Drawing.Image PhotoSizeChange(string strPhoto, int iWidth, int iHeight)
        {
            //*****strPhoto               ******// 
            //       
            System.Drawing.Image image = new Bitmap(strPhoto);//     
            //         
            System.Drawing.Image newImage = image.GetThumbnailImage(iWidth, iHeight, null, new IntPtr());
            Graphics g = Graphics.FromImage(newImage);
            //           
            g.DrawImage(newImage, iHeight, iHeight, newImage.Width, newImage.Height);
            g.Dispose();
            return newImage;
        }