ASP.NET记住登陆用户名的具体实现

…
<asp:textbox id="txtuser_id" runat="server" maxlength="4" width="120px" bordercolor="lightslategray" borderwidth="1px"></asp:textbox>
…
<asp:imagebutton id="btninsert" runat="server" imageurl="~/images/login.gif" onclick="btninsert_click" />
…
<asp:checkbox id="cbxremeberuser" runat="server" text="记住用户名" font-size="small" forecolor="gray"/>
…

    protected void page_load(object sender, eventargs e)
    {
        if (!ispostback)
        {
            this.txtuser_id.focus();
            if (!object.equals(request.cookies["userid"], null))
            {
                //创建一个cookie对象，实现记住用户名
                httpcookie readcookie = request.cookies["userid"];
                this.txtuser_id.text = readcookie.value;
            }
        }
    }
    private void createcookie()
    {
        //创建一个cookie对象
        httpcookie cookie = new httpcookie("userid");
        //判断checkbox控件是否被选中
        if (this.cbxremeberuser.checked)
        {
            //将用户编号存储到创建的cookie对象中
            cookie.value = this.txtuser_id.text;
        }
        //获取创建的cookie对象的过期时间
        cookie.expires = datetime.maxvalue;
        //将创建的cookie对象添加到内部cookie集合中
        response.appendcookie(cookie);
}

    protected void btninsert_click(object sender, imageclickeventargs e)
    {
…
        if (object.equals(request.cookies["userid"], null))
        {
          //调用自定义方法 createcookie()存储用户名
          createcookie();
        }
        else
        {
           createcookie();
        }
…
}