i need to isnert in database and i have query liike that

Code:
 str_attend = "insert into Attendees([Userid],[Attendees_name],[Attendees_telephone],[Attendees_Email] )values  (" & userid & " ," & arr(0).ToString() & " , " & arr(1).ToString() & " , " & arr(3).ToString() & " )"
all values hold values in insert statment non of of them is null.

but it gives me an exception on insert statment .