using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Rounding 18.90 - Result =" +getRound(Convert.ToDecimal(18.90)));

        Console.WriteLine("Rounding 18.30 - Result =" +getRound(Convert.ToDecimal(18.30)));

        Console.WriteLine("Rounding 18.51 - Result =" +getRound(Convert.ToDecimal(18.51)));

        Console.WriteLine("Rounding 18.49 - Result =" +getRound(Convert.ToDecimal(18.49)));

        Console.WriteLine("Rounding 18.50 - Result =" +getRound(Convert.ToDecimal(18.50)));

    }

    public static decimal getRound(decimal decAmt)

        {

            try

            {

                if (decAmt <= 0)

                    return decAmt;

​

                decimal decPortion = Convert.ToDecimal(decAmt) - Convert.ToDecimal(Math.Floor(decAmt));

                decimal intPortion = Convert.ToDecimal(Math.Floor(decAmt));

​

​

​

                if (decPortion > (Decimal)0 && decPortion < (decimal)0.50)

                {

                    decPortion = (Decimal)0;

                }

                else if (decPortion >= (Decimal)0.50)

                {

                    decPortion = (Decimal)0;

                    intPortion++;

                }

                return intPortion + decPortion;

​

​

            }

            catch

            {

                return decAmt;

            }

        }

​

}