[Winform]OpenFileDialog

필터링 하기 

  using(OpenFileDialog ofd=new OpenFileDialog())
  {
         ofd.Filter = "excel|*.xls;*.xlsx";
         if(ofd.ShowDialog()==DialogResult.OK)
         {
                label9.Text = ofd.FileName;
                fpSpread1.Open(label9.Text);
         }
  
  }