1using System;
 2using System.Data;
 3using System.Configuration;
 4using System.Web;
 5using System.Web.Security;
 6using System.Web.UI;
 7using System.Web.UI.WebControls;
 8using System.Web.UI.WebControls.WebParts;
 9using System.Web.UI.HtmlControls;
10using SqlHelper;
11public partial class _Default : System.Web.UI.Page 
12...{
13    Helper help = new Helper();
14
15    protected void Page_Load(object sender, EventArgs e)
16    ...{
17        if (!IsPostBack)
18        ...{
19            this.btnok.Attributes.Add("onclick", "Login();");//为指定控件添加HTML事件和方法
20
21            loginname.Focus();
22        }
23    }
24    protected void btnok_Click(object sender, ImageClickEventArgs e)
25    ...{
26        if (loginname.Text.Trim().Length == 0 || pwd.Text.Trim().Length == 0)
27        ...{
28            return;
29        }
30        switch (help.LoginSys(loginname.Text.Trim(), pwd.Text.Trim()))
31        ...{ 
32            case "true":
33                String LoginName = loginname.Text.Trim();
34                Session["username"] = LoginName;
35                Response.Redirect("index.htm?Name=" + Session["username"] + "");
36                break;
37            case "false":
38                Response.Redirect("erro.aspx");
39                break;
40            case "Exption":
41                Response.Redirect("ServerExption.aspx");
42                break;
43        }
44    }
45}