Storing value in localvariable from dynamic sql in sql

Question

declare @EndDate varchar(50)

set @EndDate = '2014-11-17'

declare @monthend varchar(50)

set @monthend = 'select' + ' '+ 'MONTH('+ ''''+@EndDate+''''+')'

declare @flag int

set @flag = exec @monthend

select @flag

if @flag ='11'

 

I want to store result comes from dynamic query @monthend into variable @flag.and use the value @flag in the if else condition.