管理模块/任课修改删除.aspx.cs

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using System;
using System.Data;
using System.Data.SqlClient;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

public partial class 任课信息修改 : System.Web.UI.Page
{
    public SqlDataAdapter myadapter;
    SqlConnection mysqlconnection;
    DataSet myDataSet;
    SqlCommand mysqlcommand;
    public void load()
    {
        String sqlconn = "server=.;database=学生成绩智能管理系统;Integrated Security=True;";
        mysqlconnection = new SqlConnection(sqlconn);
        mysqlcommand = mysqlconnection.CreateCommand();
        mysqlcommand.CommandText = "select distinct 成绩表.课程名,课程表.课程号 from 成绩表,学生表,课程表,教师表 where 成绩表.课程号=课程表.课程号 and 成绩表.学号=学生表.学号 and 成绩表.任课教师编号=教师表.教师编号 order by 课程表.课程号";
        mysqlconnection.Open();
        SqlDataReader myDataReader = mysqlcommand.ExecuteReader();
            DropDownList1.Items.Clear();
            while (myDataReader.Read())
            {
                this.DropDownList1.Items.Add(myDataReader.GetValue(0).ToString());
            }

            myDataReader.Close();
        mysqlconnection.Close();
        mysqlconnection.Open();
            mysqlcommand = mysqlconnection.CreateCommand();
            mysqlcommand.CommandText = "select distinct 成绩表.课程号 from 成绩表,课程表 where 课程表.课程号=(select min(课程号) from 课程表 ) and 成绩表.课程号=课程表.课程号";
            myDataReader = mysqlcommand.ExecuteReader();
            while (myDataReader.Read())
            {
                this.DropDownList3.Items.Add(myDataReader.GetValue(0).ToString());
            }
            myDataReader.Close();
        mysqlconnection.Close();
        mysqlconnection.Open();
        mysqlcommand.CommandText = "select distinct 成绩表.日期 as 日期 from 成绩表,课程表 where 课程表.课程号=(select min(课程号) from 课程表 ) and 成绩表.课程号=课程表.课程号";
            myDataReader = mysqlcommand.ExecuteReader();
            while (myDataReader.Read())
            {
                this.DropDownList2.Items.Add(myDataReader.GetValue(0).ToString());
            }
            myDataReader.Close();
        mysqlconnection.Close();
        mysqlconnection.Open();
            mysqlcommand.CommandText = "select distinct 教师编号 from 教师表";
            myDataReader = mysqlcommand.ExecuteReader();
            while (myDataReader.Read())
            {
                this.DropDownList4.Items.Add(myDataReader.GetValue(0).ToString());
            }