asp .net 大家快进来帮我看看哦

                              try
                              {                                  if (myFile.PostedFile != null)
                                  {
                                      //定义一些变量   
                                      string nam = myFile.PostedFile.FileName;//获取上传文件的完整名称
                                      string ImgName = nam.Substring(nam.LastIndexOf(@"\"));//获取上传图片的名称
                                      string ImgExtend = nam.Substring(nam.LastIndexOf(".") + 1);//获取上传图片的格式
                                      //int i = nam.LastIndexOf(@"\");
                                      //string newnm = nam.Substring(i + 1);
                                      if (!(ImgExtend == "bmp" || ImgExtend == "jpg" || ImgExtend == "gif"))
                                      {
                                          Button3.Value = "上传图片的格式不正确！";                                      }
                                      else
                                      {
                                          //Response.Write(Server.MapPath("upload"));//可以用这个来跟踪下
                                          string uploadname = Server.MapPath("~/upload/");//获取服务器上指定虚拟路径相对路径的文件夹
                                          //改变下面的“c:\\"到你想要保存的地址。   
                                          //myFile.PostedFile.SaveAs(@"C:\Documents and Settings\Administrator\桌面\完整的Test\asp.net\AWC1\upload\" + ImgName);
                                          myFile.PostedFile.SaveAs(uploadname+ImgName );
                                      
                                          ////取得上传文件的各种属性。   
                                          //fielname = myFile.PostedFile.FileName;
                                          //fielname = ( "<IMG src='" + newnm  + "'/>");
                                          fielname = ImgName;
                                          //fenc.Text=myFile.PostedFile.ContentType   ;   
                                          //fsize.Text=myFile.PostedFile.ContentLength.ToString();  
                                          Button3.Value = "上传图片成功";
                                      }                                  }
                                  else
                                  { 
                                  
                                    
                                  }                              }
                              catch (Exception error)
                              {
                                Button3.Value = "上传失败失败！原因为：" + error.ToString();
                              } fielname = ImgName; 这个本来要获取1.jpg 这样的图片名称,,但是我调试了下 获取到这样的名称 //1.jpg 我改了好久还是不行 忘大侠们帮忙