Your search for any requirement for rounding function is over. You need to round amount to quarter? dime? nickel? penny? a dollar? 10 dollar? Below function of single linen can provide you more than what you are looking for. for sure!

decimal NearestOfPenny(decimal amountToRound) { return UltimateRoundingFunction(amountToRound, 0.01m, 0.5m); } decimal NearestOfNickel(decimal amountToRound) { return UltimateRoundingFunction(amountToRound, 0.05m, 0.5m); } decimal NearestOfDime(decimal amountToRound) { return UltimateRoundingFunction(amountToRound, 0.10m, 0.5m); } decimal NearestOfQuarter(decimal amountToRound) { return UltimateRoundingFunction(amountToRound, 0.25m, 0.5m); } decimal NearestOfDollar(decimal amountToRound) { return UltimateRoundingFunction(amountToRound, 1m, 0.5m); } decimal UpwardDollarOnlyIfReminderIsMoreThan70Cents(decimal amountToRound) { return UltimateRoundingFunction(amountToRound, 1m, 0.3m); //i.e. 0.70 will round up. but 0.69 will be rounded to 0.. this magic is from value of 'fairness'. } //amountToRound => input amount //nearestOf => .25 if round to quater, 0.01 for rounding to 1 cent, 1 for rounding to $1 //fairness => btween 0 to 0.9999999___. // 0 means floor and 0.99999... means ceiling. But for ceiling, I would recommend, Math.Ceiling // 0.5 = Standard Rounding function. It will round up the border case. i.e. 1.5 to 2 and not 1. // 0.4999999... Non-standard rounding function. Where border case is rounded down. i.e. 1.5 to 1 and not 2. // 0.75 means first 75% values will be rounded down, rest 25% value will be rounded up. decimal UltimateRoundingFunction(decimal amountToRound, decimal nearstOf, decimal fairness) { return Math.Floor(amountToRound / nearstOf + fairness) * nearstOf; }