C# create folder structure and place files within folders created

File.Copy(fileName, Path.Combine(subFolder1, fileName));

File.Copy(subFolder,justFileName);

Thus can you tell me what to do differently so I can copy the files from one location to another location?

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.IO;

namespace FolderTest

{

    class Program

    {

        static void Main(string[] args)

        {

           // 1. start in a specified directory location.

            //Directory location : C:\TestFolder

            String firstFolder = @"C:\TestFolder";

            if (!Directory.Exists(firstFolder))

            {

                 Directory.CreateDirectory(firstFolder);

            }

             //2. check to see if a specified subfolder exists.

            //3. if the specified folder does not exist, create the subfolder called customer1.

            string subFolder = Path.Combine(firstFolder, "Customer1");

            if (!Directory.Exists(subFolder))

            {

                Directory.CreateDirectory(subFolder);

            }

            //4. if the subfolder  called 'docs' does not exist, create that folder.

            string subFolder1 = Path.Combine(firstFolder,"Docs");

            if (!Directory.Exists(subFolder1))

            {

                Directory.CreateDirectory(subFolder1);

            }

           // 5. if the type of document type is '*.pdf' or '*.doc' place the data file in the subfolder called

        //'docs'.

       // if the document type is of any other document type, place that document in folder level where called 'customer1'.

            string fileName = @"C:\abc.txt";

            FileInfo fileInfo = new FileInfo(fileName);

            string justFileName = Path.GetFileName(fileName);

            if ((fileInfo.Extension == ".pdf") || (fileInfo.Extension == ".doc"))

            {

                File.Copy(fileName, Path.Combine(subFolder1, fileName));

            }

            else

            {

                if (justFileName != null) File.Copy(subFolder,justFileName);

            }

        }

    }

}