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check if cookie exists asp.net

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ASP.NET

// this is the whole code
<% @Page Language="C#" %>

<script runat="server">
private void set_cookie(object sender, EventArgs e)
{
HttpCookie myCookie = new HttpCookie("MyTestCookie");
DateTime now = DateTime.Now;
// Set the cookie value.
myCookie.Value = now.ToString();
// Set the cookie expiration date.
myCookie.Expires = now.AddMinutes(1);
// Add the cookie.
Response.Cookies.Add(myCookie);
Response.Write("<p> The cookie has been written.");
}
private void read_cookie(object sender, EventArgs e)
{
HttpCookie myCookie = new HttpCookie("MyTestCookie");
myCookie = Request.Cookies["MyTestCookie"];
// Read the cookie information and display it.
if (myCookie != null)
Response.Write(myCookie.Value);
else
Response.Write("not found");
}
private void delete_cookie(object sender, EventArgs e)
{
HttpCookie myCookie = new HttpCookie("MyTestCookie");
DateTime now = DateTime.Now;
//To assign a past expiration date on a cookie
myCookie.Expires = now.AddMinutes(-1);
// Add the cookie.
Response.Cookies.Add(myCookie);
Response.Write("<p> The cookie has been deleted.");
}
</script>
<html>
<head>
</head>
<body>
<form runat="server">
<input runat="server" id="button1" type="submit" value="set cookie" OnServerClick="set_cookie"/>
<input runat="server" id="button2" type="submit" value="read cookie" OnServerClick="read_cookie"/>
<input runat="server" id="button3" type="submit" value="delete cookie" OnServerClick="delete_cookie"/>
<hr />
</form>
</body>
</html>