private string DecodeParameter(string query, string parameterName) {
string valueUtf8 = HttpUtility.ParseQueryString(query, Encoding.UTF8)[parameterName];
const char invalidUtf8Character = (char) 0xFFFD;
...
C# decode URL query part using...
by https://www.google.com/accounts/o8/id?id=AItOawlphNQfDefK1zN2sUv8LI7MP4oGfy-DeNI,
November 15, 2010 19:43,
2 refactorings, tagged with idiomatic, clarity
Firefox encodes entire URL ...