简单Cookie
private void btnRead_Click(object sender, System.EventArgs e)
{
//读取
TextBox2.Text=Request.Cookies["myName"].Values["firstname"];
}
private void btnWrite_Click(object sender, System.EventArgs e)
{
HttpCookie myCookie=new HttpCookie("myName");
//设置过期时间为1天
myCookie.Expires=System.DateTime.Now.AddDays(1);
//赋值
myCookie.Values.Add("firstname",TextBox1.Text);
Response.AppendCookie(myCookie);
}