WHERE IN (array of IDs)

I have webservice which is passed an array of ints. I'd like to do the select statement as follows but keep getting errors. Do I need to change the array to a string?

[WebMethod]
public MiniEvent[] getAdminEvents(int buildingID, DateTime startDate)
{    
    command.CommandText = @"SELECT id,
                            startDateTime, endDateTime From
                            tb_bookings WHERE buildingID IN
                            (@buildingIDs) AND startDateTime <=
                            @fromDate";

    SqlParameter buildID = new SqlParameter("@buildingIDs", buildingIDs);
}