Save and retrieve values in Cookie (C#)

<%@ Page Language="c#" %>
<script Language="c#" runat="server">
  void Page_Load(object source, EventArgs e)
  {
    if (!(IsPostBack))
    {
      MyButton.Text = "Save Cookie";
      MyDropDownList.Items.Add("Blue");
      MyDropDownList.Items.Add("Red");
      MyDropDownList.Items.Add("Gray");
    }
  }
  public void Click(object sender, EventArgs e)
  {
    HttpCookie MyCookie = new HttpCookie("Background");
    MyCookie.Value = MyDropDownList.SelectedItem.Text;
    Response.Cookies.Add(MyCookie);
  }

</script>

<html>
  <body>
    <form id="CookieForm" method="post" runat="server">
      <asp:DropDownList id=MyDropDownList runat="server"/>
      <asp:button id=MyButton runat="server" OnClick="Click"/>
    </form>
  </body>
</html>


///////////////////////////////////////////////////


<%@ Page Language="c#" %>
  <script Language="c#" runat="server">
    void Page_Load(object source, EventArgs e)
    {
      Response.Cache.SetExpires(DateTime.Now);
    }
    string GetBackground()
    {
      return Request.Cookies["Background"].Value;
    }
  </script>
  <html>
    <body bgcolor="<% Response.Write(GetBackground()); %>">
    <asp:label id="message" runat="server" />
    </body>
  </html>

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Save and retrieve values in Cookie (C#) : Cookie « Session Cookie « ASP.Net

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