public void SaveFlow(Flow steps)
{
if (File.Exists(FileName))
{
string bak = FileName + ".bak";
if (File.Exists(bak))
File.Delete(bak);
File.Move(FileName, bak);
}
string xml = steps.ToXml();
using (var wt = new StreamWriter(FileName, false, Encoding.UTF8))
{
wt.Write(xml);
wt.Flush();
}
}