HttpServerUtility.UrlDecode Method (String, TextWriter)
Decodes an HTML string received in a URL and sends the resulting output to a TextWriter output stream.
Assembly: System.Web (in System.Web.dll)
URL encoding ensures that all browsers will correctly transmit text in URL strings. Characters such as a question mark (?), ampersand (&), slash mark (/), and spaces might be truncated or corrupted by some browsers. As a result, these characters must be encoded in <a> tags or in query strings where the strings can be re-sent by a browser in a request string.
To encode or decode values outside of a web application, use the WebUtility class.
Available since 1.1