Get URL Address ASP.NET

String strPathAndQuery = HttpContext.Current.Request.Url.PathAndQuery;

String strUrl = HttpContext.Current.Request.Url.AbsoluteUri.Replace(strPathAndQuery, "/");

Result

"http://localhost:1234/"

"https://www.something.com/"

Source: http://stackoverflow.com/questions/593709/how-to-get-the-url-of-the-current-page-in-c-sharp