?using System;
using System.Data;
using System.Configuration;
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.Xml;
using xmlOp;//引用自定義命名空間

public partial class _Default : System.Web.UI.Page 
{
    string xmlFile = "";
    protected void Page_Load(object sender, EventArgs e)
    {
        btreg.Visible = false;
        xmlFile = Request.PhysicalApplicationPath + @"\xml\students.xml";//配置文件的Xml文件路徑
    }
    protected void bt1_Click1(object sender, EventArgs e)
    {
        string _username = tbusername.Text.Trim();
        string _pwd = tbpassword.Text.Trim();
        XmlOp op = new XmlOp(xmlFile);
        //驗(yàn)證用戶名和密碼
        if (op.SelectNode("//Root/Student", 0, _username) && op.SelectNode("//Root/Student", 1, _pwd))
        {
            Session["_username"] = _username;
            Response.Redirect("show.aspx");
        }
        else
        {
            Msg("用戶名或密碼錯(cuò)誤!或你還沒注冊(cè)！注冊(cè)請(qǐng)點(diǎn)確定！");
            btreg.Visible = true;
        }
    }
    protected void bt2_Click(object sender, EventArgs e)
    {
        tbusername.Text = "";
        tbpassword.Text = "";
    }
    //彈出對(duì)話框
    public void Msg(string msg)
    {
        Page pg = (Page)HttpContext.Current.Handler;
        string script = "alert('" + msg + "');";
        pg.ClientScript.RegisterStartupScript(pg.GetType(), Guid.NewGuid().ToString(), script, true);
    }
    protected void btreg_Click(object sender, EventArgs e)
    {
        Response.Redirect("reg.aspx"); 
    }
}