How to get Month Number from Month Name

How to convert month name to month number?
Here are two solutions, however, first one is best solution.

--Approach 1 [Best way]--
---------------------------------
DECLARE @MonthName varchar(15)
SET @MonthName = 'January'
SELECT MONTH(CAST(@MonthName + '1 2010' AS datetime))  AS MonthNo
GO


--Approach 2 --
---------------------------------
DECLARE @MonthName varchar(15)
SET @MonthName = 'January'
SELECT CASE @MonthName
   WHEN 'January' THEN 1
   WHEN 'February' THEN 2
   WHEN 'March' THEN 3
   WHEN 'April' THEN 4
   WHEN 'May' THEN 5
   WHEN 'June' THEN 6
   WHEN 'July' THEN 7
   WHEN 'August' THEN 8
   WHEN 'September' THEN 9
   WHEN 'October' THEN 10
   WHEN 'November' THEN 11
   WHEN 'December' THEN 12
END MonthNo
GO