在c#中的取得sql server存储过程的output参数

private void Create_Pz(string Sourcename)
        {
            string OutMsg;
            SqlParameter[] sortPara = { new SqlParameter("@ps_IsType", Pzcheck),
                                        new SqlParameter("@pi_SourceId", Pzcode),
                                        new SqlParameter("@ps_ZdrCode", ZdrCode),
                                        new SqlParameter("@OutMsg", SqlDbType.VarChar,500,ParameterDirection.Output,
                                        true,0,0,string.Empty,DataRowVersion.Default,null)
                                    };
            if (Convert.ToBoolean(SqlHelper.ExecuteNonQuery(SqlHelper.SQLCONN, CommandType.StoredProcedure, "sCwGenPzWizard", sortPara)))
            {
         &n