using System;

public class Program

{

    public static void Main()

    {

        decimal value = 10.2356M;

        Console.WriteLine(Truncate(value, 2));

    }

    public static decimal Truncate(decimal amount, byte numberOfDecimals)

    {

        decimal roundedAmount = Math.Round(amount, numberOfDecimals);

​

        if (amount > 0 && roundedAmount > amount)

        {

            return roundedAmount - new decimal(1, 0, 0, false, numberOfDecimals);

        }

        else if (amount < 0 && roundedAmount < amount)

        {

            return roundedAmount + new decimal(1, 0, 0, false, numberOfDecimals);

        }

​

        return roundedAmount;

    }

}