public static void Read_VoteBasic(int vbid, out DataTable dt)
        {
            dt = new DataTable();
            try
            {
                using (SqlConnection conn = new SqlConnection(strConn))
                {
                    SqlCommand cmd = new SqlCommand("Read_VoteBasic", conn);
                    cmd.CommandType = CommandType.StoredProcedure;

                    SqlParameter spvoteid = new SqlParameter("@pVoteID", SqlDbType.Int);
                    spvoteid.Value = vbid;

                    cmd.Parameters.Add(spvoteid);

                    conn.Open();
                    using (SqlDataAdapter sda = new SqlDataAdapter())
                    {
                        sda.SelectCommand = cmd;
                        sda.Fill(dt);
                    }
                    conn.Close();
                }
            }
            catch (Exception)
            {
                dt = null;
                //throw;
            }
        }
尽量避免使用out