C# DateDiff in Months

I need to get the difference in months between two dates.

In SQL, this is what I need:

select DATEDIFF(MONTH, '11/1/2014', DATEADD(mm, DATEDIFF(mm, 0, '12/31/2014') + 1, 0)) 

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The above date difference should be 2 months.
Difference between 12/10/2014 and 12/20/2014 = 1 month.
Difference between 11/1/2012 and 12/31/2014 = 26 months.

How do I do the same in C#?