string path = "C:/folder1/folder2/file.txt";
I would probably use something like:
string path = "C:/folder1/folder2/file.txt"; string lastFolderName = Path.GetFileName( Path.GetDirectoryName( path ) );
The inner call to
GetDirectoryName will return the full path, while the outer call to
GetFileName() will return the last path component - which will be the folder name.
This approach works whether or not the path actually exists. This approach, does however, rely on the path initially ending in a filename. If it's unknown whether the path ends in a filename or folder name - then it requires that you check the actual path to see if a file/folder exists at the location first. In that case, Dan Dimitru's answer may be more appropriate.