Problem of generating XML with dataset in Asp.net

There are often characters in the format qualifier.
For example, in datetime. tostring CodeYear, M stands for month, etc.
What if I need these characters for the tostring result?
In this case, we need to use the escape character, and this escape mark is what we are familiar "\"

Datetime now = datetime. now;
Now. tostring ("YYYY, mm, dd hh: mm: ffff"); //, 06 3425

Now. tostring (@ "\ year: yyyy, \ mon \ t \ H: Mm, \ da \ Y: dd"); // year: 2006, month: 07, Day: 06

Sometimes we need to generate a path based on the current date. How does "\" represent it?

Datetime. Now. tostring (@ "YYYY \ mm \ dd \ hhmmffff. \ TX \ t"); // 2006 \ 07 \ 06 \ 14577812.txt