protected void Page_Load(object sender, EventArgs e)
    {
      //  string [] 
        get(@"F:\");
    }

public void get(string s)
{
    try
    {
        if (File.Exists(s + @"\dad.txt"))
        {

            Response.Write("hmmmm......
");
        }
        
        
        string[] dir = Directory.GetDirectories(s);

        foreach (string f in dir)
        {
            if (f != null)
            {
                string file = f + @"\rr.txt";
                if (File.Exists(file))
                {
                    Response.Write("filepath is " + file);
                    Response.Write("
");
                }
                get(f);
            }

        }
    }
    catch (Exception e1)
    {
        //Response.Write(f);
    }

   }