014. asp.net实现记住密码的功能

  protected void Button1_Click(object sender, EventArgs e)
     {
         if (txtname.Text.Trim().Equals("mr") && txtpwd.Text.Trim().Equals("mrsoft"))
         {
             Session["username"] = txtname.Text.Trim();
             if (ckbauto.Checked)
             {
                 if (Request.Cookies["username"] == null)
                 {
                     Response.Cookies["username"].Expires = DateTime.Now.AddDays();
                     Response.Cookies["userpwd"].Expires = DateTime.Now.AddDays();
                     Response.Cookies["username"].Value = txtname.Text.Trim();
                     Response.Cookies["userpwd"].Value = txtpwd.Text.Trim();
                 }
             }
             Response.Redirect("admin.aspx");
         }
         else
         {
             ClientScript.RegisterStartupScript(this.GetType(),"","alert('用户名或密码错误！');",true);
         }
     }
     protected void txtname_TextChanged(object sender, EventArgs e)
     {
         if (Request.Cookies["username"] != null)
         {
             if (Request.Cookies["username"].Value.Equals(txtname.Text.Trim()))
             {
                 txtpwd.Attributes["value"] = Request.Cookies["userpwd"].Value;
             }
         }
     }

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