Schedule creation for cron-based SCADA systems

using System;
using System.Collections;
using System.Collections.Generic;
//using System.Linq;using System.Text;
using System.Xml;
using System.Threading;
using System.Xml.Linq;
namespaceClassLibrary
{
    publicclassMyClass
    {
			ArrayList ArrayListVentModes_local;
    		public ArrayList ArrayListVentModes{
    		    get{
    		      return ArrayListVentModes_local;
    		    }
    		}    
    		publicstring FilePath{
    			set{ this.filepath_local = value ; }
    		}
    		publicstring Massege_str{
    		    get; set;
    		}
    		publicstring CountElement{
    		    get; set;
    		}
    		string filepath_local ;
    		ArrayList arr;
            intinnerInterval(string CronFormatStr){
            string[] word = CronFormatStr.Split(' ');
            DateTime dt = DateTime.Now;
            if (word.Length == 7)
            {
                try
                {
                    int dayOfWeekArray = 0;
                    if (word[4] != "*") {
                        dayOfWeekArray = Convert.ToInt32(word[4]);
                    }
                    DateTime dt_start = new DateTime(
                        (word[5] == "*") ? dt.Year : Convert.ToInt32(word[5]),
                        (word[3] == "*") ? dt.Month : Convert.ToInt32(word[3]),
                        (word[2] == "*") ? dt.Day: Convert.ToInt32(word[2]),
                        (word[1] == "*") ? dt.Hour : Convert.ToInt32(word[1]),
                        (word[0] == "*") ? 0 : Convert.ToInt32(word[0]),
                        0 );
                    DateTime dt_end = dt_start.AddMinutes(Convert.ToInt32(word[6]));
                    if (dt >= dt_start && dt <= dt_end)
                    {
                        if (dayOfWeekArray != Convert.ToInt32(dt.DayOfWeek) && dayOfWeekArray > 0)
                        {
                            return0;
                        }
                        return1;
                    }
                }
                catch (FormatException)
                {
                    return-1;
                }
                catch
                {
                    return-10;
                }
            }
            return-1;
        }
        int clamp = 0;  
                publicvoidmain_metod() {
               if (this.clamp != 1)  {
             Thread tRec = new Thread(new ThreadStart(XMLread));
             tRec.Start();
             this.clamp = 1 ; 
              }
          }  
            publicvoidXMLread() {
            arr = new ArrayList();
            int prio;
            XmlDocument xmlDocument = new XmlDocument();
            try{
            xmlDocument.Load(filepath_local);
            Massege_str = "Открыт успешно" ;
            }
            catch
            {
            	Massege_str = "Ошибка открытия файла" ;
            	return;
            }
            foreach (XmlNode device in xmlDocument.SelectNodes("/timemode/device"))
            {
                prio = -1;
                string strmode = "???" ;
                foreach (XmlNode mode in xmlDocument.SelectNodes("/timemode/device[@ID=\"" + device.Attributes["ID"].Value + "\"]/mode"))
                {
                    int prioNew = Convert.ToInt16(mode.Attributes["priority"].Value) ;
                    if ((innerInterval(mode.Attributes["timeperiod"].Value) > 0 ) && prio < prioNew)
                    {
                        strmode = mode.Attributes["type"].Value;
                        prio = prioNew ;
                    }
                }
                string newmes = (device.Attributes["ID"].Value + ">" + strmode);
                arr.Add(newmes);
            }
            ArrayListVentModes_local = arr;
            CountElement = ">" + ArrayListVentModes.Count.ToString();
            Thread.Sleep(5000);
            clamp = 0;
        }
    }
}