FileUpload上传图片

 protected void Button1_Click(object sender, EventArgs e)    {        bool Files = false;        //判断文件的类型是否符合要求        if(this .FileUpload1.HasFile)        {            //获取删除文件的后缀            string fileSuffix = System.IO.Path.GetExtension(this .FileUpload1.FileName).ToLower();            string[] Suffix={".jpg",".bmp",".gif","pnd"};            //判断文件是否符合要求            for (int i = 0; i < Suffix.Length;i++)            {                if (fileSuffix == Suffix[i])                {                    Files = true;                }            }        }

        //如果符合要求就上次,并显示信息        if (Files == true)        {            this.Image1.ImageUrl = "~/imager/" + FileUpload1.FileName;            this.FileUpload1.SaveAs(Server.MapPath("~/imager/") + FileUpload1.FileName);        }        else {            Page.ClientScript.RegisterStartupScript(Page.GetType(), "message", "<script language='javascript' defer>alert('文件上传失败！');</script>");  

        }    }