database range

ok, i have some code here:

VB Code:

objSelectIon.Parameters("ListID").Value = m_random
        objConnection.Open()
        Dim objReader As OleDbDataReader = objSelectIon.ExecuteReader
        objReader.Read()

IndexOutOfRangeException pops up on my first line here, and i don't know why
m_Random is a random generator with min 1 max 32
the range of ListID is 1 to 32

why would this be happening?