Get Directory name from full path of file?

I am new to C#, please help me to get the directory name from full path of a file, say

D:\Projects\ProjectName\CarDocuments\CarBook.pdf

use .DirectoryInfo(path).Name to get the directory Name

String dirName = new System.IO.DirectoryInfo(path).Name;

Check this by using FileInfo

FileInfo fileInfo = new FileInfo(path);
String dirName = fileInfo.Diretory.Name;