In console Application i got one doubt

protected void btnCopyDir_Click(object sender, EventArgs e)
    {
        try
        {
            System.IO.DirectoryInfo SrcDir = new System.IO.DirectoryInfo(txtsrc.Text);
            System.IO.DirectoryInfo DestDir = new System.IO.DirectoryInfo(txtdest.Text);
            CopyDir(SrcDir, DestDir);
            lblResult.Text = "Directories and Files Copied successfully...!!!";
        }
        catch (Exception ex)
        {
            lblResult.Text = ex.Message;
        }
    }
    protected void CopyDir(System.IO.DirectoryInfo src, System.IO.DirectoryInfo dest)
    {
        if (!dest.Exists)
        {
            dest.Create();
            System.IO.FileInfo[] files = src.GetFiles();
            foreach (System.IO.FileInfo file in files)
            {
                file.CopyTo(System.IO.Path.Combine(dest.FullName, file.Name));
            }
            System.IO.DirectoryInfo[] dirs = src.GetDirectories();
            foreach (System.IO.DirectoryInfo dir in dirs)
            {
                string destDir = System.IO.Path.Combine(dest.FullName, dir.Name);
                CopyDir(dir, new System.IO.DirectoryInfo(destDir));
            }
        }
        else if (dest.Exists)
        {
            
            System.IO.FileInfo[] files = src.GetFiles();
            foreach (System.IO.FileInfo file in files)
            {
                string filenamechk=System.IO.Path.Combine(dest.FullName, file.Name);
                var exists=System.IO.Directory.GetFiles(dest.FullName).Any(x=> x.Equals(filenamechk,StringComparison.OrdinalIgnoreCase));
                if(!exists)
                {
                    file.CopyTo(System.IO.Path.Combine(dest.FullName, file.Name));
                }               
            }
        }
    }

using System;
using System.IO;
using System.Linq;

namespace DemoConsoleApp
{
 class Program
 {
  static void Main(string[] args)
  {
   var sourceDirectory = new DirectoryInfo(@"D:\Test1");
   var destinationDirectory = new DirectoryInfo(@"D:\Test2");
   CopyDirectory(sourceDirectory, destinationDirectory);
  }
  private static void CopyDirectory(DirectoryInfo sourceDirectory, DirectoryInfo destinationDirectory)
  {
   if (!destinationDirectory.Exists) destinationDirectory.Create();
   var sourceFiles = sourceDirectory.GetFiles();
   foreach (var file in sourceFiles)
   {
    file.CopyTo(Path.Combine(destinationDirectory.FullName, file.Name));
   }
   var sourceDirectories = sourceDirectory.GetDirectories();
   foreach (var sourceDir in sourceDirectories)
   {
    var destDir = Path.Combine(destinationDirectory.FullName, sourceDir.Name);
    CopyDirectory(sourceDir, new DirectoryInfo(destDir));
   }
   var files = sourceDirectory.GetFiles();
   foreach (var f in from file in files let checkFileName = Path.Combine(destinationDirectory.FullName, file.Name) where !Directory.GetFiles(destinationDirectory.FullName).Any(x => x.Equals(checkFileName, StringComparison.OrdinalIgnoreCase)) select file)
   {
    f.CopyTo(Path.Combine(destinationDirectory.FullName, f.Name));
   }
   sourceDirectory.Delete(true);
  }
 }
}