how to get numbers to a specific decimal place c#

Question

im a newbie doing windows forms c# so i recently wanted to create something like a cashier payment calculation button, but then i got stucked at the rounding part. For example, if the total amount is $40.2 3 , how can i make it round up to #40.2 5 instead of going down to $40.2 0 ? Or maybe $40.2 6 to $40.2 5 ?

the total amount values are get from textboxes and the final after-rounded value will be display in textbox as well. hope i was not being too unclear about my question. thanks guys

Answer 1

Try this:

decimal value = 40.23m;
decimal rounded = Math.Round(value * 20.0m, 0) / 20.0m;

Then rounded is 40.25m .