Passing Comma Separated Value From .net To Stored Procedure And Using The Value In "IN" Function In Sql?

I have a sql query something like below.

create procedure test
(
@param1 nvarchar(max)
)
as
begin
select * from table where column1 in (@param1)
end

Now i need to pass the value of @param1 from my .net application in such a way that the above query works.

how from my vb.net code i can pass a value which is similiar to below

'1','2','3'

Main question is how do i structure value of parameter like above example from my .net application