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   public enum DateInterval
    {
        Second, Minute, Hour, Day, Week, Month, Quarter, Year
    }

 

 

public sealed class DateTimeManger
    {
        private DateTimeManger()
        { }//end of default constructor
        public static long DateDiff(DateInterval Interval, System.DateTime StartDate, System.DateTime EndDate)
        {
            long lngDateDiffValue = 0;
            System.TimeSpan TS = new System.TimeSpan(EndDate.Ticks - StartDate.Ticks);
            switch (Interval)
            {
                case DateInterval.Second:
                    lngDateDiffValue = (long)TS.TotalSeconds;
                    break;
                case DateInterval.Minute:
                    lngDateDiffValue = (long)TS.TotalMinutes;
                    break;
                case DateInterval.Hour:
                    lngDateDiffValue = (long)TS.TotalHours;
                    break;
                case DateInterval.Day:
                    lngDateDiffValue = (long)TS.Days;
                    break;
                case DateInterval.Week:
                    lngDateDiffValue = (long)(TS.Days / 7);
                    break;
                case DateInterval.Month:
                    lngDateDiffValue = (long)(TS.Days / 30);
                    break;
                case DateInterval.Quarter:
                    lngDateDiffValue = (long)((TS.Days / 30) / 3);
                    break;
                case DateInterval.Year:
                    lngDateDiffValue = (long)(TS.Days / 365);
                    break;
            }
            return (lngDateDiffValue);
        }//end of DateDiff
        public static bool IsNumeric(string value)
        {
            return System.Text.RegularExpressions.Regex.IsMatch(value, @"^[+-]?/d*[.]?/d*$");
        }
        public static bool IsInt(string value)
        {
            return System.Text.RegularExpressions.Regex.IsMatch(value, @"^[+-]?/d*$");
        }
        public static bool IsUnsign(string value)
        {
            return System.Text.RegularExpressions.Regex.IsMatch(value, @"^/d*[.]?/d*$");
        }
        public static void fillTime(Control ctl)
        {
            int intHour = 0;
            int intMinutes = 0;
           
            ((ComboBox)ctl).Items.Clear();
            while (intHour<=23)
            {
                if(intHour.ToString().Length == 1 && intMinutes.ToString().Length ==1)
                {
                    ((ComboBox)ctl).Items.Add("0" + intHour.ToString() + ":" + "0" + intMinutes.ToString());
                }
                else if (intHour.ToString().Length == 1)
                {
                    ((ComboBox)ctl).Items.Add("0" + intHour.ToString() + ":" + intMinutes.ToString());
                }
                else if (intMinutes.ToString().Length == 1)
                {
                    ((ComboBox)ctl).Items.Add(intHour.ToString() + ":" + "0" + intMinutes.ToString());
                }
                else
                {
                    ((ComboBox)ctl).Items.Add(intHour.ToString() + ":"  + intMinutes.ToString());
                }
                if (intMinutes == 0)
                {
                    intMinutes = 30;
                }
                else
                {
                    intMinutes = 0;
                }
                if (intMinutes == 0)
                    intHour++;
            }
        }
    }//end of class