014. asp.net实现记住密码的功能

 1  protected void Button1_Click(object sender, EventArgs e)
 2     {
 3         if (txtname.Text.Trim().Equals("mr") && txtpwd.Text.Trim().Equals("mrsoft"))
 4         {
 5             Session["username"] = txtname.Text.Trim();
 6             if (ckbauto.Checked)
 7             {
 8                 if (Request.Cookies["username"] == null)
 9                 {
10                     Response.Cookies["username"].Expires = DateTime.Now.AddDays(30);
11                     Response.Cookies["userpwd"].Expires = DateTime.Now.AddDays(30);
12                     Response.Cookies["username"].Value = txtname.Text.Trim();
13                     Response.Cookies["userpwd"].Value = txtpwd.Text.Trim();
14                 }
15             }
16             Response.Redirect("admin.aspx");
17         }
18         else
19         {
20             ClientScript.RegisterStartupScript(this.GetType(),"","alert('用户名或密码错误！');",true);
21         }
22     }
23     protected void txtname_TextChanged(object sender, EventArgs e)
24     {
25         if (Request.Cookies["username"] != null)
26         {
27             if (Request.Cookies["username"].Value.Equals(txtname.Text.Trim()))
28             {
29                 txtpwd.Attributes["value"] = Request.Cookies["userpwd"].Value;
30             }
31         }
32     }

注: 对于txtname控件, 需要将其的AutoPostBack属性, 设置为True, 这样当用户输入用户名之后, 会自动回发到服务器, 执行TextChanged事件