like linq sql

i have slight needs accept an array republic names, relapse list annals review those republic names. i'm perplexing this

public common duty getconcessions(byval countries string()) ienumerable
    low countrylist twine = utility.joinarray(countries) ' turns twine array comma-separated string
    relapse (from t new db().concessions _
                    where countrylist t.country _
                    name t.concessionid, t.title, t.country)
end function

but i error

  *only arguments evaluated fan upheld method

in plain sql, simple:

 name concessionid,title concessions c where @countrylist '%' + c.country + '%'

how i grasp outcome linq sql?

edit (clarification)

i same summary string.contains. glorious

t.country.contains(countrylist)

but i need

countrylist.contains(t.country) 

and throws same blunder i listed above.