class Program
{
    private static readonly string filePath = Environment.CurrentDirectory;

    static void Main(string[] args)
    {
       var filename = "bazarganidb.db";
       var bkupFilename = Path.GetFileNameWithoutExtension(filename) + ".bak";

       CreateDB(filePath, filename);

       BackupDB(filePath, filename, bkupFilename);
       RestoreDB(filePath, bkupFilename, filename, true);
    }

    private static void RestoreDB(string filePath, string srcFilename, string 
    destFileName, bool IsCopy = false)
    {
       var srcfile = Path.Combine(filePath, srcFilename);
       var destfile = Path.Combine(filePath, destFileName);

       if (File.Exists(destfile)) File.Delete(destfile);

       if (IsCopy)
          BackupDB(filePath, srcFilename, destFileName);
       else
          File.Move(srcfile, destfile);
    }

    private static void BackupDB(string filePath, string srcFilename, string 
    destFileName)
    {
       var srcfile = Path.Combine(filePath, srcFilename);
       var destfile = Path.Combine(filePath, destFileName);

       if (File.Exists(destfile)) File.Delete(destfile);

       File.Copy(srcfile, destfile);
    }

    private static void CreateDB(string filePath, string filename)
    {
       var fullfile = Path.Combine(filePath, filename);
       if (File.Exists(fullfile)) File.Delete(fullfile);

       File.WriteAllText(fullfile, "this is the dummy data");
    }
}