protected void btnSend_Click(object sender, EventArgs e)     {         try         {             //上传文件的思路：             //获取上传文件的名称，此时为一个全路径的地址             string upFileName = fulFileName.FileName;             //获取上传文件的扩展名             string lastName = upFileName.Substring(upFileName.LastIndexOf("."));             //得到新的文件名称             string newFileName = txtFileName.Text + lastName;             //设置要保存到的文件路径             string FilePath =Server.MapPath("./")+"File"+"//"+newFileName;             //将文件保存到指定文件路径下             fulFileName.PostedFile.SaveAs(FilePath);             lblResult.Text = "上传成功";         }         catch (Exception ex)         {             Response.Write(ex.Message.ToString());             lblResult.Text = "上传失败";         }       }