private string OpenFileDlog(string DeafultDir)

{

OpenFileDialog Ofd = new OpenFileDialog();

Ofd.AddExtension = true;

Ofd.Filter = "文本文档(*.txt)|*.txt|所有文件(*.*)|*.*";

Ofd.InitialDirectory = DeafultDir.Trim() == "" ? Environment.GetFolderPath(Environment.SpecialFolder.Desktop) : DeafultDir;

try

{

Ofd.ShowDialog();

}

catch { }

if (Ofd.FileName == null || Ofd.FileName.Trim() == "")

return DeafultDir;

else

return Ofd.FileName;

}