UrlEncoding Plus(+) in URL in ASP.Net

public static String DoDecryption(String Value)
	{
		Decryptor dec = new Decryptor(EncryptionAlgorithm.TripleDes );
		dec.IV = Encoding.ASCII.GetBytes("funky");
		byte [] DecValue =  Convert.FromBase64String(Value.Replace("+++","=="));
		byte [] DecKey   = Encoding.ASCII.GetBytes("0123456789012345");
		byte [] DecipherValue = dec.Decrypt(DecValue,DecKey);
		return Encoding.ASCII.GetString(DecipherValue);
	}

public static String DoEncryption(String Value)
	{
		Encryptor enc = new Encryptor(EncryptionAlgorithm.TripleDes);
		byte [] EncValue =  Encoding.ASCII.GetBytes(Value);
		byte [] EncKey   = Encoding.ASCII.GetBytes("0123456789012345");
		enc.IV = Encoding.ASCII.GetBytes("funky");
		byte [] CipherValue = enc.Encrypt(EncValue,EncKey);
		//InitVector = Encoding.ASCII.GetString(enc.IV);
		return Convert.ToBase64String(CipherValue).Replace("==","+++");
	}