c# - error insert query after install application -


i testing program , when runed in vs without error execute ! code :

private void button1_click(object sender, eventargs e)         {             oledbconnection conect = new oledbconnection();             conect.connectionstring = "provider=microsoft.jet.oledb.4.0;" + "data source=university.mdb;jet oledb:database password=sa@a";             conect.open();             oledbcommand o1 = new oledbcommand();             o1.connection = conect;             if(button1.text=="save")                o1.commandtext = "insert check_user(name_user,pw_user)values('" + textbox1.text + "','" + textbox2.text + "')";             else                 o1.commandtext = " select * check_user (name_user =  '" + textbox1.text + "') , (pw_user =  '" + textbox2.text + "' )";             o1.executenonquery();              if (button1.text != "save")             {                 if (o1.executescalar() == null)                     messagebox.show("wrong user");                 else                 {                     groupbox1.visible = false;                     menustrip1.visible = true;                 }             }             else             {                 groupbox1.visible = false;                 menustrip1.visible = true;             }              conect.close();         }

but when execute after install app , run query error occurs : http://s4.picofile.com/file/8184692692/qq.png query select without error executed query insert or delete occurs error please me

you can't use nonquery "select". try this

if(button1.text=="save") {     o1.commandtext = "insert check_user(name_user,pw_user)values('" + textbox1.text + "','" + textbox2.text + "')";    o1.executenonquery(); }  else {     o1.commandtext = " select * check_user (name_user = '" + textbox1.text + "') , (pw_user = '" + textbox2.text + "' )";     o1.executequery(); }​

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