HttpClient vs WebClient

http://qaru.site/questions/44427/deciding-between-httpclient-and-webclient

http://www.diogonunes.com/blog/webclient-vs-httpclient-vs-httpwebrequest/

https://stackoverflow.com/questions/20530152/deciding-between-httpclient-and-webclient/27737601#27737601

https://stackoverflow.com/questions/53156825/is-it-better-to-use-httpclient-or-webrequest-in-asp-net-core-to-read-the-content

https://stackoverflow.com/questions/4988286/what-difference-is-there-between-webclient-and-httpwebrequest-classes-in-net

var http = (HttpWebRequest)WebRequest.Create("http://example.com");
var response = http.GetResponse();

var stream = response.GetResponseStream();
var sr = new StreamReader(stream);
var content = sr.ReadToEnd();

 var client = new WebClient();

var content = client.DownloadString("http://example.com");

https://stackoverflow.com/questions/33020657/how-to-replace-webclient-with-httpclient

https://stackoverflow.com/questions/29947843/webclient-vs-httpclient-async-request

Web DownLoad Xml & Parse

https://stackoverflow.com/questions/3175790/how-can-i-download-an-xml-file-using-c

XPath Find Element with Attribute

https://stackoverflow.com/questions/14248063/xpath-to-select-element-by-attribute-value

XML atributes to XML element

https://stackoverflow.com/questions/10728017/convert-all-xml-attributes-to-elements

https://stackoverflow.com/questions/10645359/convert-xml-attributes-to-elements-xslt

https://stackoverflow.com/questions/31401620/convert-xml-elements-to-xml-attributes-using-xslt

https://stackoverflow.com/questions/6496334/c-sharp-to-convert-xml-attributes-to-elements

https://docs.microsoft.com/ru-ru/dotnet/standard/serialization/controlling-xml-serialization-using-attributes

https://stackoverflow.com/questions/30747477/get-xml-node-by-attribute-value-and-de-serialize-that-node

Guid

https://docs.microsoft.com/ru-ru/dotnet/api/system.guid.newguid?view=netframework-4.8

https://blogs.msdn.microsoft.com/ruericlippert/2012/07/31/guid-1/

https://stackoverflow.com/questions/7981190/how-to-generate-absolutely-unique-guids

https://www.guidgenerator.com/

https://www.dotnetperls.com/guid

http://qaru.site/questions/217769/guidnewguid-vs-a-random-string-generator-from-randomnext

https://www.c-sharpcorner.com/UploadFile/prasoonk/guids-in-C-Sharp-and-net/

https://www.c-sharpcorner.com/article/what-is-guid-in-c-sharp/

https://ru.wikipedia.org/wiki/GUID

FireFox Tracking Protection

http://testsoft.su/otklyuchaem-slezhku-nastroika-privatnosti-v-firefox/

SubString c учетом регистра С#

http://qaru.site/questions/323456/find-a-substring-in-a-case-insensitive-way-c

Contains() - не хиляет без учета регистра

нет версии без учета регистра. Вместо этого используйте IndexOf (или регулярное выражение, хотя это не рекомендуется и излишне).

string string1 = "my string";
string string2 = "string";
bool isContained = string1.IndexOf(string2, StringComparison.OrdinalIgnoreCase) >= 0;


StringComparison.OrdinalIgnoreCase обычно используется для более "программируемого" текста, такого как пути или константы, которые вы могли сгенерировать, и является самым быстрым средством сравнения строк. Для текстовых строк, которые являются лингвистическими, используйте StringComparison.CurrentCultureIgnoreCase или StringComparison.InvariantCultureIgnoreCase.