With System.Web.Routing 4.5 you may implement this straightforward by setting LowercaseUrls property of RouteCollection:
public static void RegisterRoutes(RouteCollection routes)
{
routes.IgnoreRoute("{resource}.axd/{*pathInfo}");
routes.LowercaseUrls = true;
routes.MapRoute(
name: "Default",
url: "{controller}/{action}/{id}",
defaults: new { controller = "Home", action = "Index", id = UrlParameter.Optional }
);
}
Also assuming you are doing this for SEO reasons you want to redirect incoming urls to lowercase (as said in many of the links off this article).
protected void Application_BeginRequest(object sender, EventArgs e)
{
//You don't want to redirect on posts, or images/css/js
bool isGet = HttpContext.Current.Request.RequestType.ToLowerInvariant().Contains("get");
if (isGet && !HttpContext.Current.Request.Url.AbsolutePath.Contains("."))
{
//You don't want to modify URL encoded chars (ex.: %C3%8D that's code to í accented I) to lowercase, than you need do decode the URL
string urlLowercase = Request.Url.Scheme + "://" + HttpUtility.UrlDecode(HttpContext.Current.Request.Url.Authority + HttpContext.Current.Request.Url.AbsolutePath);
//You want to consider accented chars in uppercase check
if (Regex.IsMatch(urlLowercase, @"[A-Z]") || Regex.IsMatch(urlLowercase, @"[àèìòùáéíóú?ê?????????üY?]"))
{
//You don't want to change casing on query strings
urlLowercase = urlLowercase.ToLower() + HttpContext.Current.Request.Url.Query;
Response.Clear();
Response.Status = "301 Moved Permanently";
Response.AddHeader("Location", urlLowercase);
Response.End();
}
}
}
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