how to add serial key to client system when he visit our website

Question

i want to add 3 serial key to client system using httpcookie when he visited my website my website off course in asp.net MVC

but

serial key is different different not same.

when i add a 4th cookie then 1 key is automatically deleted.

how i can do this.

when user want to see then he can see recent 3 key.

Are you know how to add this cookie to client system by asp.net mvc website.

how i can add key1 , key 2 , key3 to client system.

Answer 1

Here's how you can do that.

Writing the serial-keys.

//create a cookie
HttpCookie SerialKeys = new HttpCookie("SerialKeys");

//Add serial-key-values in the cookie
SerialKeys.Values.Add("key1", "your-first-serialkey");
SerialKeys.Values.Add("key2", "your-second-serialkey");
SerialKeys.Values.Add("key3", "your-third-serialkey");
SerialKeys.Values.Add("key4", "your-fourth-serialkey");

//set cookie expiry date-time. Made it to last for next 12 hours.
SerialKeys.Expires = DateTime.Now.AddHours(12);

//Most important, write the cookie to client.
Response.Cookies.Add(SerialKeys);

Reading the serial-key cookie.

//Assuming user comes back after several hours. several < 12.
//Read the cookie from Request.
HttpCookie SerialKeys = Request.Cookies["SerialKeys"];
if (SerialKeys == null)
{
    //No cookie found or cookie expired.
    //Handle the situation here, Redirect the user or simply return;
}

//ok - cookie is found.
//Gracefully check if the cookie has the key-value as expected.
if (!string.IsNullOrEmpty(SerialKeys.Values["key1"]))
{
    string serialKey = SerialKeys.Values["key1"].ToString();
    //Yes key1 is found. Mission accomplished.
}

if (!string.IsNullOrEmpty(SerialKeys.Values["key2"]))
{
    string serialKey = SerialKeys.Values["key2"].ToString();
    //Yes key2 is found. Mission accomplished.
}