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using System.IO;
string directoryPath = @"C:\Users\john\Documents\example";
string folderName = Path.GetFileName(directoryPath);
Console.WriteLine("Folder name: " + folderName);
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string filename = @"C:/folder1/folder2/file.txt";
string FolderName = new DirectoryInfo(System.IO.Path.GetDirectoryName(filename)).Name;
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string[] folders = System.IO.Directory.GetDirectories(@"C:\My Sample Path\","*", System.IO.SearchOption.AllDirectories);