C#: Pagination, Math.Ceiling

Question

I'm creating some pagination and I'm getting an issue.

If I have a number 12 and I want to divide that by 5 (5 is the number of results I want on a page), how would I round it up properly? This doesn't work:

int total = 12;
int pages = Math.Ceiling(12 / 5);
//pages = 2.4... but I need it to be 3

Answer 1

Even though your code should work, Math.Round is wrong though, you could try this:

int pages = (total + pageSize - 1)/pageSize;

That should be the same as Math.Ceiling except that you are always dealing with int and not double at any point as Math.Ceiling returns.

EDIT: To get your code to work you could try:

int pages = (int)Math.Ceiling((double)12/(double)5);

But you should use the first example.

Answer 2

you could do:

int numPages = Math.Ceiling((decimal)12 / (decimal)5);

or

int numPages = (12 + 4) / 5;  //(total + (perPage - 1)) / perPage