c# - delete folder/files and subfolder -

i want delete folder containing files , subfolder, containing files. have used everything, not working me. i'm using following function in web-application asp.net:

var dir = new directoryinfo(folder_path); dir.delete(true);  

sometimes deletes folder, or doesn't. if subfolder contains file, deletes file, , not folder well.

this looks right: http://www.ceveni.com/2008/03/delete-files-in-folder-and-subfolders.html

//to call below method emptyfolder(new directoryinfo(@"c:\your path"))   using system.io; // dont forget use header  //method delete files in folder , subfolders  private void emptyfolder(directoryinfo directoryinfo) {     foreach (fileinfo file in directoryinfo.getfiles())     {               file.delete();      }      foreach (directoryinfo subfolder in directoryinfo.getdirectories())     {       emptyfolder(subfolder);     } }