private int NumMondays(string month_name, string year_name) 
{ 
 int i; 
 int num_mondays; 
 System.DateTime test_date; 
 int orig_month; 
 test_date = System.Convert.ToDateTime(month_name + " 1, " + year_name); 
 if (Weekday(test_date) == vbMonday) { 
 } else if (Weekday(test_date) == vbTuesday) { 
   test_date = DateAdd("d", 6, test_date); 
 } else if (Weekday(test_date) == vbWednesday) { 
   test_date = DateAdd("d", 5, test_date); 
 } else if (Weekday(test_date) == vbThursday) { 
   test_date = DateAdd("d", 4, test_date); 
 } else if (Weekday(test_date) == vbFriday) { 
   test_date = DateAdd("d", 3, test_date); 
 } else if (Weekday(test_date) == vbSaturday) { 
   test_date = DateAdd("d", 2, test_date); 
 } else if (Weekday(test_date) == vbSunday) { 
   test_date = DateAdd("d", 1, test_date); 
 } 
 orig_month = Month(test_date); 
 do { 
   num_mondays = num_mondays + 1; 
   test_date = DateAdd("ww", 1, test_date); 
 } while ((Month(test_date) == orig_month)); 
 NumMondays = num_mondays; 
}