How to use routecollection in ASP.NET ?

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C#

ASP.NET

Hello
I want to use RouteCollection in my asp.net web site.

What I have tried:

in Global.asax :

void Application_Start(object sender, EventArgs e)
{
   RouteConfig.RegisterRoutes(RouteTable.Routes);
}

public static void RegistRoute(RouteCollection routes)
{
   routes.MapPageRoute("HomePage", "Home", "~/ClientSide/Forms/Index.aspx");
}

but when I want to address it in href="Home", I get Error the Page does not Exist.

What should I do ?