Pass a collection to a SPROC

I am collecting companyID's form a data grid, I want to pass the selected values to a sproc via a variable. Any idea on the syntax?

this works using a query string within my code

WHERE (dbo.Promotions.ExpirationDate > GETDATE()) AND (dbo.Promotions.CompanyID IN (" + selectedCompanies + "))

this doesn't within my sproc

WHERE (dbo.Promotions_ByLink.ExpirationDate > GETDATE()) AND (dbo.Promotions_ByLink.CompanyID IN (@.SelectedCompanies))

I also tried

WHERE (dbo.Promotions_ByLink.ExpirationDate > GETDATE()) AND (dbo.Promotions_ByLink.CompanyID IN (SELECT @.SelectedCompanies))

and

WHERE (dbo.Promotions_ByLink.ExpirationDate > GETDATE()) AND (dbo.Promotions_ByLink.CompanyID IN (' + @.SelectedCompanies + '))

ThanksI know it's a little dirty, but I just created an user defined function to parse out a comma delimited string, and return a recordset of one column. Select [code] FROM dbo.MyFunctionName(@.myCommaDelimitedString) can be used in your where clause.|||Thanks,
I will give that a try|||We've had this discussion several times in this forum -- there are various solutions and various advocates of the different solutions (e.g.view post 306752). I happen to use the one KraGiE suggests. Here's an example of the parsing function:Treat Yourself to Fn_Split().

Terri|||Thanks a TON..I search the other post, but I didn't know what to search for.
Thanks again