Check directory exists

Hi Expert,

I try to create a directory if it does not exist. However, my program always
see the directory exist even it does not exist.

Could you help?
Thx,
JT

DateTime dt = DateTime.Now;
            string today = "c:\\rate\\" + dt.ToString("yyyyMMdd");
    
            if (!System.IO.Directory.Exists(today))
            {
                MessageBox.Show("The directory " + today + " already exists!");
            }
            else
            {
                // @ is like a kind of escape.
//                Directory.CreateDirectory(@"C:\" + today);
                Directory.CreateDirectory(today);
            }

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