cookies

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<asp:label id="myRequestCookie"
style="Z-INDEX: 101; LEFT: 26px; POSITION: absolute; TOP: 22px"
runat="server" Width="220px" BorderStyle="Groove">
-----------------------------------</asp:label>
<asp:button id="btnCookies.Set"
style="Z-INDEX: 102; LEFT: 26px; POSITION: absolute; TOP: 56px"
runat="server" Width="220px" Text="Set Cookie"></asp:button>
<asp:button id="btnClearCookie"
style="Z-INDEX: 103; LEFT: 26px; POSITION: absolute; TOP: 84px"
runat="server" Width="220px" Text="Clear Cookie"></asp:button>
<asp:Button id="btnDoNothing"
style="Z-INDEX: 104; LEFT: 26px; POSITION: absolute; TOP: 112px"
runat="server" Width="220px" Text="Do Nothing"></asp:Button>

private void Page_Load(object sender, System.EventArgs e)
{
    // Display the Request cookie on the page
    if (Request.Cookies["TestCookie"] == null)
        myRequestCookie.Text = "No cookie found";
    else
        myRequestCookie.Text = Request.Cookies["TestCookie"].Value;
}

private void btnCookies.Set_Click(object sender, System.EventArgs e)
{
    // Set up a cookie and redirect to this page to pick it up for display
    Response.Cookies["TestCookie"].Value = "Cookie is set";
    Response.Cookies["TestCookie"].Expires = DateTime.Now.AddYears(30);
    Response.Redirect("Example5.1.aspx");
}

private void btnClearCookie_Click(object sender, System.EventArgs e)
{
    // Expire the cookie and redirect to this page to display a message
    Response.Cookies["TestCookie"].Expires = DateTime.Now.AddYears(-30);
    Response.Redirect("Example5.1.aspx");
}

private void btnDoNothing_Click(object sender, System.EventArgs e)
{
// Do absolutely nothing except redirect to simulate moving to another page
Response.Redirect("Example5.1.aspx");
}

http://www.codeproject.com/Articles/3106/On-The-Care-and-Handling-of-Cookies