if (str_display.toString() == ""))和 if (str_result == null))有什么区别,

if (str_display.toString() == ))和 if (str_result == null))有什么区别, 帮忙翻译下ASP.NET语句sqlconn.Open（）； sqlcmd.CommandText ：= ‘select * from v_SignUp_ini where kszldm=’+ dplkind.SelectedValue； sdr=sqlcmd.ExecuteReader； if sdr.Read then begin TextBox1.Text ：= sdr.item[‘报名开始’].tost voa上的一句话不太懂,can anybody help me?Send these,the homeless,tempest-tost to me,I lift my lamp beside the golden door.特别是其中tempest-tost不解其意,请多多指教! if if if 英语翻译1.energy saver mode2.advanced minimal3.fan speed4.automatie/ low/ medam /high5.post messages6.tost mode7.after power loss8.remote wakeup boot soarce9.local hard brive10.remote server11.onboard devices12.memory hole13.PCI VGA palette snoop 小学四年级上册英语1.找出下列单词中多余的字母,并将正确的填在横线上.breuad__________ hiit____________ eate__________2.阅读并回答问题. In the morning we have breakfast . Tost,apples,milk and eggs “if any”“if ever”“if “if any”“if ever”“if IF ANY,IF SO,IF NOT,IF if never,if any,if not,if if(a) {if(b =IF(IF(D6 only if/if if only ,if necessary if...else if.else if.else if.的用法是什么 IF I