Exam/SingleSelectAdd.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 OnLineExam.BusinessLogicLayer;

public partial class Web_SingleSelectAdd : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!Page.IsPostBack)
        {
            InitDDLData();          //初始化考试科目下拉列表框          
            if (Request["ID"] != null)//如果是修改题目，初始化数据
            {
                InitData();
            }
        } 

    }
    //初始化考试科目
    protected void InitDDLData()
    {
        Course course = new Course();       //创建考试科目对象
        DataSet ds = course.QueryCourse();  //查询考试科目信息
        ddlCourse.DataSource = ds;          //指名考试科目列表框数据源
        ddlCourse.DataTextField = "Name";   //DataTextField显示Name字段值
        ddlCourse.DataValueField = "ID";    //DataValueField显示ID字段值
        ddlCourse.DataBind();               //绑定数据
    }
    //初始化数据
    protected void InitData()
    {
        int SingleProblemID = int.Parse(Request["ID"].ToString());  //取出传递过来的试题编号
        SingleProblem singleproblem = new SingleProblem();          //创建单选题对象
        if (singleproblem.LoadData(SingleProblemID))                //如果取出题目信息，分别放在相应控件显示
        {
            ddlCourse.SelectedValue = singleproblem.CourseID.ToString();
            txtTitle.Text = singleproblem.Title;
            txtAnswerA.Text = singleproblem.AnswerA;
            txtAnswerB.Text = singleproblem.AnswerB;
            txtAnswerC.Text = singleproblem.AnswerC;
            txtAnswerD.Text = singleproblem.AnswerD;
            ddlAnswer.SelectedItem.Text = singleproblem.Answer;
        }
        else                //查询出错，给出提示
        {
            lblMessage.Text = "加载数据出错！";
        }
    }

    //添加或修改事件
    protected void imgBtnSave_Click(object sender, ImageClickEventArgs e)
    {