Directory.GetDirectories Method (String)
Gets the names of subdirectories (including their paths) in the specified directory.
Assembly: mscorlib (in mscorlib.dll)
The caller does not have the required permission.
path is a zero-length string, contains only white space, or contains one or more invalid characters.
path is null.
The specified path, file name, or both exceed the system-defined maximum length. For example, on Windows-based platforms, paths must be less than 248 characters and file names must be less than 260 characters.
path is a file name.
The specified path is invalid (for example, it is on an unmapped drive).