C# DateTime.ParseExact with backslashes in format

C# DateTime.ParseExact with backslashes in format

I've got some sub directories that are named with dates like so:
C:\SomeDirectory\201309\01
C:\SomeDirectory\201309\02
C:\SomeDirectory\201309\03
C:\SomeDirectory\201309\04
C:\SomeDirectory\201309\05
etc.
What I'm trying to do is get the directory listing and then use Linq to
limit my results based on a date range.
I've got it working like so:
string path = @"C:\SomeDirectory";
DateTime f = new DateTime(2013, 9, 1);
DateTime t = new DateTime(2013, 9, 3);
DateTime dt;
var dirs =
Directory.GetDirectories(path, "*.*", SearchOption.AllDirectories)
.Where(d => DateTime.TryParseExact(
d.Substring(Math.Max(0, d.Length - 9)).Replace("\\", null),
"yyyyMMdd",
CultureInfo.Invarient,
DateTimeStyles.None,
out dt)
&& f <= dt
&& dt <= t);
I would, however, like to change the TryParseExact portion so that I don't
have to replace the backslash - like so:
DateTime.TryParseExact(
d.Substring(Math.Max(0, d.Length - 9)),
@"yyyyMM\dd",
CultureInfo.Invarient,
DateTimeStyles.None,
out dt)
But, it seems TryParseExact does not like that format. I was thinking this
may have something to do with the CultureInfo - but I was unable to track
down a possible solution to help me with the backslash.
Any assistance would be greatly appreciated!