HttpServerUtility.UrlEncode Method (String)
URL-encodes a string and returns the encoded string.
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.
In the code-behind file for an ASP.NET web page, access an instance of the HttpServerUtility class through the Server property. In a class that is not in a code-behind file, use HttpContext.Current.Server to access an instance of the HttpServerUtility class.
Outside of a web application, use the WebUtility class to encode or decode values.
The following example shows how to URL-encode a value that is used as a query string value of a hyperlink. The code resides in the code-behind file for a web page. The value to encode is hard-coded in this example only to simplify the example and show the type of value you might URL-encode. Typically, you would URL-encode a value that you received from the user or the request. NextPage refers to a HyperLink control.
The next example is similar to the previous example except it shows how to URL-encode a value from within a class that is not in the code-behind file.
Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.