Save and retrieve information from the session (by default expires in 20)

Saving in the session

protected void LoginButton_Click(object sender, EventArgs e)
    {
        string username = NameTextBox.Text;
        
        //HttpCookie cookie =  new HttpCookie("UserInfo");
        //cookie["Username"] = username;
        //cookie.Expires = DateTime.Now.AddDays(1);
        //Response.Cookies.Add(cookie);

        Session["Username"] = username;
        Response.Redirect("OrderPage.aspx");
    }

Retrieving

protected void ProceedButton_Click(object sender, EventArgs e)
    {
        string username = (string)Session["Username"];
        string product = ProductTextBox.Text;
        Session["Product"] = product;

        string url = string.Format("CustomerDetails.aspx");
        Response.Redirect(url);
    }