How to get the no of days in a month using C#

 private static int[] NoofdaysInMonth = { 0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };

    public int getDaysInMonth(int intmonth, int intyear)
    {
        int intdays;

        if (intmonth < 1 || intmonth > 12 || intyear < 1 || intyear > 9999)
        {
            return 0;
        }
        if (intmonth != 2)    for february check
        {
            intdays = NoofdaysInMonth[intmonth];
        }
        else
        {
            intdays = NoofdaysInMonth[2] + CheckLeapYear(intyear);
        }
        return intdays;
    }

     public int CheckLeapYear(int intyear)
    {
        if (intyear % 4 == 0 && intyear % 100 != 0 || intyear % 400 == 0)
            return 1;   // It is a leap year
        else
            return 0;   // Not a leap year
    }