I have also tried shielding the \'/\' symbol in the formatting string, but it didn\'t quite work. My final goal is to get the date with the \'/\' symbols as separators. I g
The / character in date/time format strings stands for "whatever the date separator of the format provider is". Since you do not supply a format provider Thread.CurrentCulture is used, and in your case the current culture uses . as the date separator.
If you want to use a literal slash, place it inside single quotes:
dateTime.ToString("dd'/'MM'/'yyyy");
Alternatively, you could specify a format provider where the date separator is /:
dateTime.ToString("dd/MM/yyyy", CultureInfo.InvariantCulture);
All of the above is documented on MSDN.
See the difference in a live example.