c# - Problems with finding efficient way of getting folder/file names/paths from drives -

i've been trying learn how create windows explorer clone using treeview hold of folder , file names , paths.

i looked lot of examples , used recursion fine, however, i've been trying huge amount of folder/file names/paths (300k+) , becomes quite slow (takes few minutes data , put treeview).

below recursion method using folder , file names , paths:

public static treenode createdirectorynode(directoryinfo directoryinfo, treenode parentnode = null)     {         var directorynode = new treenode(directoryinfo.name);          foreach (var directory in directoryinfo.getdirectories())         {             parentnode = new treenode(directory.name);             parentnode.tag = directory.fullname;              directorynode.nodes.add(createdirectorynode(directory, parentnode));         }          foreach (var file in directoryinfo.getfiles())         {             treenode tnfile = new treenode(file.name);             tnfile.tag = file.fullname;              directorynode.nodes.add(tnfile);         }         return directorynode;     }