Example: Next Coupon Date After the Settlement Date

In this example, the settlement date is 11/11/86. The previous coupon date before this date is returned.
using System;
using Imsl.Finance;

public class coupncdEx1
{
    public static void  Main(String[] args)
    {
        DateTime settlement = DateTime.Parse("11/11/86");
        DateTime maturity = DateTime.Parse("3/1/99");
        Bond.Frequency freq = Bond.Frequency.SemiAnnual;
        DayCountBasis dcb = DayCountBasis.BasisActual365;
        DateTime coupncd = Bond.Coupncd(settlement, maturity, freq,
                                        dcb);
        Console.Out.WriteLine("The next coupon date after the " +
                              "settlement date is " + coupncd);
    }
}

Output

The next coupon date after the settlement date is 3/1/1987 12:00:00 AM

Link to C# source.