.net帮忙指导一下cookie

if (cookie值 !=0)
{
会话用户名=cokie
会话ID=cokie
IE=cokie
}
ELSE
{
...
..
..
..
COOKIE=NAME
COOKIE =PWD
COOKIE =ID
保存天数
}

思路是这个样子的~~但是我不知道怎么写~~~。。

小弟分部多 先谢谢了~~在线等

//保存

HttpCookie cook = new HttpCookie("uid", txtUid.Text.Trim());
cook.Expires.AddDays(double.Parse(DropDownList1.SelectedValue));
Response.Cookies.Add(cook);

//提取

if (Request.Cookies["uid"] != null)
{
lnkUid.Text = "您好" + Request.Cookies["uid"].Value;

}