string savePath = "";
SaveFileDialog sfd = new SaveFileDialog();
sfd.Filter = "txt files (*.docx)|*.docx|All files (*.*)|*.*";
sfd.RestoreDirectory = true;
if(sfd.ShowDialog()==DialogResult.OK)
{
savePath = sfd.FileName;
}
else
{
return;
}
if (savePath == "") return;