I have found that when calling SQL 2000 sprocs that I need to tell the command object that it is calling a sproc. Maybe this is true with the OledbCommand object as well. Where I use Sql you should use the OleDB versions of the same objects instead.
C#
private void MyFunction()
{
SqlConnection conn = new SqlConnection("my_conn_string);
SqlCommand comm = new SqlCommand("my_sproc_name", conn as SqlConnection);
comm.CommandType = CommandType.StoredProcedure;
conn.Open();
SqlDataReader dr = comm.ExecuteReader();
while( dr.Read() )
{
extract data here with your code
}
comm.Dispose();
conn.Dispose();
}