retrieve last modified filename from nested directories

Question

I have a root directory and inside that further directories are there. These directories contains various Html and ncx files. I have to get the name of the file that has been last modified. I am using this code

    string filePath = @"~\FolderName\";  
string completeFilePath = Server.MapPath(filePath);  
var directory = new DirectoryInfo(completeFilePath);  
var fileName = (from f in directory.GetFiles()  
orderby f.LastWriteTime descending  
select f).First();  
lblDisplayFileName.Text=fileName.ToString();  

But it is only searching files that are placed only in root directory. It is not searching files that are present further in directories of root directory. I don't know how to get last modified filename of the files that are present further in nested directories. I have to display the name of file that has been last modified from all of the files irrespective of present in any directory.

Answer 1

Have a look at the documentation of DirectoryInfo.GetFiles:

MSDN:

Returns a file list from the current directory.

You have to use the overload that takes a SearchOption:

directory.GetFiles("*.*", SearchOption.AllDirectories) 

Answer 2

Try the overload of GetFiles which takes 2 parameters

from f in directory.GetFiles(".", SearchOption.AllDirectories)

SearchOption specifies whether the search operation should include only the current directory or all subdirectories.