How to copy, paste, delete files in c sharp

using System.IO;

string file = "C:\\Program Files\\Cortex\\Log\\Backup.log";
string filecp = "C:\\Program Files\\Cortex\\Log\\Backup_copy.log";

void Delete()
{
   if (!File.Exists(file))
      File.Delete(file);
}

void Copy()
{
   if (!File.Exists(file))
      File.Copy(file, filecp);
}