Arrange text files in a directory according to their previous folder names (C#)

This is a program that can re arrange all the text files in a directory in another directory within folders which having their previous folder names. You can try this for any file type (I did for text files).

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace imagecoppy
{
    class Program
    {
        static void Main(string[] args)
        {
     

           formatDri();

            Console.ReadKey();
        }

        static void renameFiles() { 
        
        
        }

       

        static void formatDri() {
            System.IO.DirectoryInfo dif = new System.IO.DirectoryInfo(@"D:\vishwa");
            System.IO.DirectoryInfo[] subdif  = dif.GetDirectories();
            System.IO.DirectoryInfo txtdir = dif.CreateSubdirectory("TEXTFILES");
            System.IO.FileInfo[] dirname;
            foreach (System.IO.DirectoryInfo sub in subdif) {
           
               
                dirname = sub.GetFiles("*.txt*");
                if (dirname.Length != 0)
                {
                    txtdir.CreateSubdirectory(sub.Name);
                    foreach (System.IO.FileInfo txtfile in dirname)
                    {
                       
                        txtfile.CopyTo(@"D:\vishwa\TEXTFILES\" + sub.Name + "\\" + txtfile.Name, false);
                    }
            }

            System.IO.FileInfo[] txtInfo=dif.GetFiles("*.txt*");
            // this part is same as the previous post 
           
            
            }
        
        }
    }
}