public class ContactHelper
{
public ContactHelper ()
{

}


UPDATE: I just added in a search bar, and image cache management for clearing the cache. I made the sample app a little google images search tool.

http://github.com/SuperYeti/MonoTouch.Dialog.Extensions.

http://github.com/SuperYeti/MonoTouch.Dialog/

Download Source Here, rename to *.tar.gz

public static class PageSecurity
    {
        private const string bKey = "Fvjh834funw0uw34nf9we80yfw07FYB3Q4FNH74329";

        private static byte[] bSalt {
            get { return new byte[] { 0x23, 0x5e, 0x2d, 0x65, 0x94, 0x7a, 0x62, 0x64, 0x5d, 0x3c,0xe3, 0xee, 0xfa }; }
        }

        public static string EncryptString (string plainText)
        {
            Rfc2898DeriveBytes rdb = new Rfc2898DeriveBytes (bKey + UIDevice.CurrentDevice.UniqueIdentifier, bSalt);

            byte[] Key = rdb.GetBytes (32);

            byte[] IV = rdb.GetBytes (16);

            // Check arguments.
            if (plainText == null || plainText.Length <= 0)
                throw new ArgumentNullException ("plainText");
            if (Key == null || Key.Length <= 0)
                throw new ArgumentNullException ("Key");
            if (IV == null || IV.Length <= 0)
                throw new ArgumentNullException ("IV");

            // Declare the stream used to encrypt to an in memory
            // array of bytes.
            MemoryStream msEncrypt = null;

            // Declare the RijndaelManaged object
            // used to encrypt the data.
            RijndaelManaged aesAlg = null;

            try {
                // Create a RijndaelManaged object
                // with the specified key and IV.
                aesAlg = new RijndaelManaged ();
                aesAlg.Key = Key;
                aesAlg.IV = IV;

                // Create a decrytor to perform the stream transform.
                ICryptoTransform encryptor = aesAlg.CreateEncryptor (aesAlg.Key, aesAlg.IV);

                // Create the streams used for encryption.
                msEncrypt = new MemoryStream ();
                using (CryptoStream csEncrypt = new CryptoStream (msEncrypt, encryptor, CryptoStreamMode.Write)) {
                    using (StreamWriter swEncrypt = new StreamWriter (csEncrypt)) {

                        //Write all data to the stream.
                        swEncrypt.Write (plainText);
                    }
                }
            } finally {
                // Clear the RijndaelManaged object.
                if (aesAlg != null)
                    aesAlg.Clear ();
            }

            // Return the encrypted bytes from the memory stream.
            byte[] retArray = msEncrypt.ToArray ();

            return Convert.ToBase64String (retArray, 0, retArray.Length);

        }

        public static string DecryptString (string cipher)
        {
            Rfc2898DeriveBytes rdb = new Rfc2898DeriveBytes (bKey + UIDevice.CurrentDevice.UniqueIdentifier, bSalt);

            byte[] Key = rdb.GetBytes (32);

            byte[] IV = rdb.GetBytes (16);

            byte[] cipherText = Convert.FromBase64String (cipher);

            // Check arguments.
            if (cipherText == null || cipherText.Length <= 0)
                throw new ArgumentNullException ("cipherText");
            if (Key == null || Key.Length <= 0)
                throw new ArgumentNullException ("Key");
            if (IV == null || IV.Length <= 0)
                throw new ArgumentNullException ("IV");

            // Declare the RijndaelManaged object
            // used to decrypt the data.
            RijndaelManaged aesAlg = null;

            // Declare the string used to hold
            // the decrypted text.
            string plaintext = null;

            try {
                // Create a RijndaelManaged object
                // with the specified key and IV.
                aesAlg = new RijndaelManaged ();
                aesAlg.Key = Key;
                aesAlg.IV = IV;

                // Create a decrytor to perform the stream transform.
                ICryptoTransform decryptor = aesAlg.CreateDecryptor (aesAlg.Key, aesAlg.IV);
                // Create the streams used for decryption.
                using (MemoryStream msDecrypt = new MemoryStream (cipherText)) {
                    using (CryptoStream csDecrypt = new CryptoStream (msDecrypt, decryptor, CryptoStreamMode.Read)) {
                        using (StreamReader srDecrypt = new StreamReader (csDecrypt))

                            // Read the decrypted bytes from the decrypting stream
                            // and place them in a string.
                            plaintext = srDecrypt.ReadToEnd ();
                    }
                }
            } finally {
                // Clear the RijndaelManaged object.
                if (aesAlg != null)
                    aesAlg.Clear ();
            }

            return plaintext;
        }

        public static string EncryptString (int value)
        {
            return EncryptString (value.ToString ());

        }
    }


public static class PageSecurity
{
private const string bkey = "AnyAlphaNumbericStr1ng";

return UTF8Encoding.UTF8.GetString(resultArray);
}
}