学生模块/Default4.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 Default4 : System.Web.UI.Page
{
    string student;
    protected void Page_Load(object sender, EventArgs e)
    {
        student = this.Session["name"].ToString();
        if (DropDownList1.Text == "")
        {
            string myConnstr = "data source=.;database=学生成绩智能管理系统;Integrated Security=True;";
            SqlConnection myConn = new SqlConnection(myConnstr);
            string sql = "select 课程名 from 课程表 ";
            myConn.Open();
            SqlCommand myComm = new SqlCommand(sql, myConn);
            SqlDataReader myDataReader = myComm.ExecuteReader();
            while (myDataReader.Read())
                this.DropDownList1.Items.Add(myDataReader.GetValue(0).ToString());
            myConn.Close();
        }
        if (DropDownList2.Text == "")
        {
            string myConnstr1 = "data source=.;database=学生成绩智能管理系统;Integrated Security=True;";
            SqlConnection myConn1 = new SqlConnection(myConnstr1);
            string sql1 = "select distinct 成绩表.日期 from 成绩表,学生表,课程表 where 成绩表.课程号=课程表.课程号 and 成绩表.学号='" + student + "' and 学生表.学号='" + student + "'";
            myConn1.Open();
            SqlCommand myComm1 = new SqlCommand(sql1, myConn1);
            SqlDataReader myDataReader1 = myComm1.ExecuteReader();
            while (myDataReader1.Read())
                    this.DropDownList2.Items.Add(myDataReader1.GetValue(0).ToString());
            myConn1.Close();
        }
    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        int n = 1;
        string stu2;
        float stu1, stu3=0,stu4;
        string myConnstr = "data source=.;database=学生成绩智能管理系统;Integrated Security=True;";
        SqlConnection myConn = new SqlConnection(myConnstr);
        string sql = "select 成绩表.成绩 from 课程表,成绩表 where 课程表.课程名='" + DropDownList1.Text + "'and 成绩表.学号='" + student + "' and 课程表.课程号 = 成绩表.课程号";
        myConn.Open();
        SqlCommand myComm = new SqlCommand(sql, myConn);
        SqlDataReader myDataReader = myComm.ExecuteReader();
        Label2.Text = DropDownList1.Text;
        while (myDataReader.Read())
        {
            stu3 = float.Parse(myDataReader.GetValue(0).ToString());
        }
        myConn.Close();