how to calculate month difference between two days in c#

For example, 
2008/01/01 and 2008/05/01 = 4
2008/01/02 and 2008/05/01 = 3

I got it.
now and past are DateTime varaiables.
int monthsApart = 12 * (now.Year - Past.Year) + now.Month - Past.Month;
if (now.Day < Past.Day) 
{
monthsApart--;
}

You could use timespan
Timespan ts =  Date1 - Date2
 convert the result to months.
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Using Timespan, the end result will be in days, not in months, and I cannot just divide it by 30 to assume that each month is 30 days.