为什么这么简单的问题我都不会?

为什么这么简单的问题我都不会?
string str = System.Configuration.ConfigurationManager.AppSettings["sqlConnString"];
SqlConnection sc = new SqlConnection(str);
sc.Open();
string sqls = "insert into teacher_info_north(teacher_id,teacher_num,comp_num,tea_name,tea_password,dm_num,tea_address,department_id,tel,mobile_tel,salary_num_state,salary_num,lastdate,grade_type,tea_money,tea_grade,endmonth,ip_id,equip_num,port_id,area,rline,mline,sline,fline,checked,ep_state,move_state,user_state,install_state,equip_install_state,stopnet,set_date,set_id)values('" + intArray[0] + "','" + intArray[1] + "','" + intArray[2] + "','" + intArray[3] + "','" + intArray[4] + "','" + intArray[5] + "','" + intArray[6] + "','" + intArray[7] + "','" + intArray[8] + "','" + intArray[9] + "','" + intArray[10] + "','" + intArray[11] + "','" + intArray[12] + "','" + intArray[13] + "','" + intArray[14] + "','" + intArray[15] + "','" + intArray[16] + "','" + intArray[17] + "','" + intArray[18] + "','" + intArray[19] + "','" + intArray[20] + "','" + intArray[21] + "','" + intArray[22] + "','" + intArray[23] + "','" + intArray[24] + "','" + intArray[25] + "','" + intArray[26] + "','" + intArray[27] + "','" + intArray[28] + "','" + intArray[29] + "','" + intArray[30] + "','" + intArray[31] + "','" + intArray[32] + "','" + intArray[33] + "')";
SqlCommand comm = new SqlCommand(sqls, sc);
comm.ExecuteNonQuery();
sc.Close();
它说物品的第一行“,”处有语法错误,编译无错,运行的时候才出错,谢谢各位大侠救助我下

intArray[15] + "','" + intArray[16]两个逗号