Teacher/AddStScore1.aspx.cs

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using System;
using System.Data;
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;
using System.Data.SqlClient;

public partial class Teacher_AddStScore : System.Web.UI.Page
{
    Alert alert = new Alert();
    data data = new data();
    data mydata = new data();
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {


            DropDownList2.DataSource = mydata.GetDataReader("select * from  Course where TeacherID='" + Session["id"].ToString()+ "' ");
            DropDownList2.DataTextField = "courseName";
            DropDownList2.DataValueField = "id";
            DropDownList2.DataBind();


            DropDownList3.DataSource = mydata.GetDataReader("select * from  student where xuehao in(select Stuid from SelectCourse where CourseId='" + DropDownList2.SelectedValue + "')   ");
            DropDownList3.DataTextField = "xuehao";
            DropDownList3.DataValueField = "UserName";
            DropDownList3.DataBind();

            if (!string.IsNullOrEmpty(Request.QueryString["id"]))
            {

                SqlDataReader ds =null ;
                ds = mydata.GetDataReader("select *  from stscore where id="+Request.QueryString["id"]+"");
                if (ds.Read())
                {

                    DropDownList2.SelectedItem.Text = ds["courseName"].ToString();
                    DropDownList3.SelectedItem.Text = ds["stxuehao"].ToString();
                    TextBox1.Text = ds["xueqi"].ToString();
                    TextBox2.Text = ds["score"].ToString();
                    txtds.Text = ds["remark"].ToString();
                    LinkButton1.Text = "修改";
                }
            
            }

        }
    }

    protected void LinkButton1_Click(object sender, EventArgs e)
    {
        if (string.IsNullOrEmpty(Request.QueryString["id"]))
        {
            string bj = null;