Refresh folder in C#

while (true)
            {
                try
                {  
                    
                    
                    string abc, def= "";
                    abc= ConfigurationManager.AppSettings.Get("apath");
                    def= ConfigurationManager.AppSettings.Get("dpath");
                    
                    DateTime dt1= File.GetLastAccessTime(abc);
                    DateTime dt2= File.GetLastAccessTime(def);
                    
                    Console.WriteLine("the last access time for  abc{0}", dt1);
                    Console.WriteLine("the last access time for def{0}", dt2);

                    TimeSpan timediff = DateTime.Now - dt1;
                    TimeSpan timediff1 = DateTime.Now - dt2;
                    // DateTime.Now.Subtract(teltonika).Minutes > 5

                    if( timediff.TotalMinutes > 5)
                    {
                        DataClasses1DataContext db = new DataClasses1DataContext();
                        var  u = db.tbl_urgent_contacts;
                        foreach (var a in u)
                        {
                            tbl_OutBox tb = new tbl_OutBox();
                            tb.FromSIM_No = a.SimNo;
                            tb.ToSIM_No = a.SimNo;
                            tb.ToText = "Check abc";
                            tb.Reply = "NA";
                            tb.Response = "NA";
                            tb.RegNo = "NA";
                            tb.Datetd = DateTime.Now;
                            tb.FFID = "NA";
                            tb.UserId = "You";
                            tb.FromText = "Check abc";
                            db.tbl_OutBoxes.InsertOnSubmit(tb);
                            db.SubmitChanges();
                        } 
                    }
                    if (timediff1.TotalMinutes > 5)
                    {
                        DataClasses1DataContext db = new DataClasses1DataContext();
                        var u = db.tbl_urgent_contacts;
                        foreach (var a in u)
                        {
                            tbl_OutBox tb = new tbl_OutBox();
                            tb.FromSIM_No = a.SimNo;
                            tb.ToSIM_No = a.SimNo;
                            tb.ToText = "Check def";
                            tb.Reply = "NA";
                            tb.Response = "NA";
                            tb.RegNo = "NA";
                            tb.Datetd = DateTime.Now;
                            tb.FFID = "NA";
                            tb.UserId = "You";
                            tb.FromText = "Check def";
                            db.tbl_OutBoxes.InsertOnSubmit(tb);
                            db.SubmitChanges();
                        }
                    }
                   
                }
                catch (Exception e)
                {
                    Console.WriteLine("The process failed: {0}", e.ToString());
                }
                Thread.Sleep(5000);
            }
        }

<add key="apath" value="C:\Users\Administrator\Desktop\New folder" />
<add key="dpath" value="C:\Users\Administrator\Desktop\New folder" />