Encrypt and Decrypt cookie

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encryption

cookie

Hello i am trying to encrypt a cookie (name and value) and then restore its value

i am trying this code but there is a problem its always get null.

public class Auth
{
    public static string Lang
    {
        get
        {
            if (HttpContext.Current.Request.Cookies[Encryption.Encrypt("Lang")] == null || HttpContext.Current.Request.Cookies[Encryption.Encrypt("Lang")].Value == null) return null;
            return Encryption.Decrypt( HttpContext.Current.Request.Cookies[Encryption.Encrypt("Lang")].Value);
        }
        set
        {
            HttpCookie s = new HttpCookie(Encryption.Encrypt("Lang"), Encryption.Encrypt( value));
            s.Expires = DateTime.Now.AddYears(1);
            HttpContext.Current.Response.Cookies.Add(s);
        }
    }

    public static bool IsArabic { get { return Lang == "Arabic" && Lang != null; } }
    public static bool IsEnglish { get { return Lang != "Arabic" && Lang != null; } }




}

when i use the cookie :

Auth.Lang = "English";

test the cookie :

if(Auth.IsEnglish)

but always get null ... can anyone help ?