How to encode and decode the string into array of bytes using UTF-16LE?

UnicodeEncoding unicode = new UnicodeEncoding();

// Create a string that contains Unicode characters.
String unicodeString = " (\u03a3).";

Response.Write("Original string:");
Response.Write(unicodeString);
Response.Write("<br />");
// Encode the string.
Byte[] encodedBytes = unicode.GetBytes(unicodeString);
Response.Write("<br />");
Response.Write("Encoded bytes:");
foreach (Byte b in encodedBytes)
{
    Response.Write(String.Format("[{0}]", b));
}
Response.Write("<br />");
// Decode bytes back to string.
// Notice Pi and Sigma characters are still present.
String decodedString = unicode.GetString(encodedBytes);
Response.Write("<br />");
Response.Write("Decoded bytes:");
Response.Write(decodedString);