Help in Var Sorting

[vijy]

i am practising Linq samples from ..MSDN

I struck with a thing.
Am trying to get files from a directory.
The file names in the folder are 1.rtf,2.rtf,3.rtf.....10.rtf...., 20.rtf...,, 30.rtf

try
 {
     var ofileLst = from n in Directory.GetFiles(@"C:\Users\is1828\Desktop\OCR Data") 
                       where Path.GetExtension(n).Equals(".rtf") 
                       select n;
 
     foreach (var fil in ofileLst)
     {   }
                
 }
catch (Exception e)
{ }

i neeed to sort th ofileLst on the basis of filename.
because when looping, 1.rtf.10.rtf,.... 20.rtf,..

but i need to get file in the sorted way..