Unity3D连接MSSQL以及遇见的一个问题

void Start()
    {
        using (SqlConnection conn = new SqlConnection(Conn))
        {
            conn.Open();
            string sql = string.Format(GetInsertStepString(userName, stepType, step));
            using (SqlCommand cmd = new SqlCommand(sql, conn))
            {
                cmd.ExecuteNonQuery();
            }
            conn.Close();
        }
    }