How to use QueryString

How can I have different URL ids like www.somewebsite.com/index?theidentifier=34 only in ASP.N开发者_开发问答ET MVC not Webforms.

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Well, for what purpose? Just to access the value? All querystring values can be routed to params in the action method like:

public ActionResult index(int? theidentifier)
{
   //process value
}

Or, you can use the QueryString collection as mentioned above, I think it's via this.RequestContext.HttpContext.Request.QueryString.

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If you want to handle your routing in ASP.NET MVC, then you can open Global.asax and add calling of routes.MapRoute in RegisterRoutes method.

The default routing configuration is {controller}/{action}/{id} => ex: http://localhost/Home/Index/3 , controller = HomeController, Action=About, id=3.

You may add something like :

routes.MapRoute( "NewRoute", // Route name "Index/{id}", // URL with parameters new { controller = "Home", action = "Index",id=1 } // Parameter defaults );

so http://localhost/Index/3 will be accepted

Remember to add these code above the default route configuration, because ASP.NET will search for the first matching route