T-SQL check for Integer value

declare @string as varchar(20)
set @string = '1.01'

select 'test' as col1,
case
WHEN ISNUMERIC(@string) = 0 THEN 0
WHEN @string LIKE '%[^-+ 0-9]%' THEN 0
WHEN CAST(@string AS NUMERIC(38, 0))
 NOT BETWEEN -2147483648. AND 2147483647. THEN 0
ELSE 1
end as intCol