Sql and Where Clause with Data Type Table

Transact-SQL
1

Hi, i have a data type table which i pass from C# with list of int.
i use it in the query :
select * from tbl1 where statudid in (select id from datatypetable)
the questio if the data type table which i pass is empy,
how can i get all value as doing some like

select...
where
statusid=case when "datatypetable is empty" then statusid else (select id from datatypetable) end

thanks

2

where (not exists(select 1 from dbo.datatypetable) or statusid in (select id from datatypetable))

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