Request.Cookies : Request « Page Lifecycle « ASP.NET Tutorial

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2. Page Lifecycle
3. Request

<script language="C#" runat="server" trace="true" >
protected void Page_Load(object o, EventArgs e) {
HttpCookie outbound = new HttpCookie("MyCookie");

HttpCookie inbound = Request.Cookies["MyCookie"];
if(inbound != null) {
    outbound.Value = (Int32.Parse(inbound.Value) + 1).ToString();
    theLabel.Text = inbound.Value;
}
else {
    outbound.Value = "1";
}
Response.Cookies.Add(outbound);
}
</script>
<asp:label runat="server" id="theLabel" Text="no cookie value received" />