To, FromBase64 and ToHash (Flash code friendly) Extension

Three methods for String, ToBase64 string and FromBase64 string and a ToHash with saltkey

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public static class StringExtension
    {
        public static string ToBase64(this string x)
        {
            var toEncodeAsBytes = Encoding.ASCII.GetBytes(x);
            var returnValue = Convert.ToBase64String(toEncodeAsBytes);
            return returnValue;
        }

        public static string FromBase64(this string x)
        {
            var toEncodeAsBytes = Convert.FromBase64String(x);
            var returnValue = Encoding.ASCII.GetString(toEncodeAsBytes);
            return returnValue;
        }

        public static string ToHash(this string x,string saltKey)
        {
            var keyStringBuilder = new StringBuilder();
            keyStringBuilder.Append(x);
            keyStringBuilder.Append(saltKey);

            var originalBytes = Encoding.Default.GetBytes(keyStringBuilder.ToString());
            var hashedDataBytes = new MD5CryptoServiceProvider().ComputeHash(originalBytes);

            var hexHashBuilder = new StringBuilder();
            foreach (byte b in hashedDataBytes)
            {
                hexHashBuilder.AppendFormat("{0:x2}", b);
            }
            byte[] encbuff = Encoding.UTF8.GetBytes(hexHashBuilder.ToString());
            return Convert.ToBase64String(encbuff);
        }
    }