Exam/SelectPaper.aspx.cs

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using System;
using System.Collections.Generic;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using OnLineExam.BusinessLogicLayer;
using System.Data;

public partial class Exam_SelectPaper : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!Page.IsPostBack)
        {
            InitData();
        }
    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        Users user = new Users();
        if (user.IsTest(Session["userID"].ToString().Trim(), Convert.ToInt32(ddlPaper.SelectedValue)))
        {
            lblMessage.Text = "您已经考试过了,不能再考试！";
        }
        else
        {
            Session["PaperID"] = ddlPaper.SelectedValue;
            Session["PaperName"] = ddlPaper.SelectedItem.Text;
            Response.Redirect("UserTest.aspx");    //转向考试界面       
        }
    }


    //初始化考试科目下拉列表框
    protected void InitData()
    {
        Paper paper = new Paper();              //创建Paper对象
        DataSet ds = paper.QueryPaper();        //查询所有可用试卷
        if (ds.Tables[0].Rows.Count >= 1)
        {
            ddlPaper.DataSource = ds;           //指名考试科目列表框数据源
            ddlPaper.DataTextField = "PaperName";   //DataTextField显示Name字段值
            ddlPaper.DataValueField = "PaperID";    //DataValueField显示ID字段值
            ddlPaper.DataBind();                //绑定数据

        }
        else
        {
            ddlPaper.Enabled = false;
            Button1.Enabled = false;
            lblMessage.Text = "没有试卷！";
        }
    }
}