Asp.Net URl Routing..Can't Pass Querystring from one page to another

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C#

ASP.NET4

I am trying to use Routing in pages for my website. When user click category name then i can passed catid into ArticlesList.aspx page...if user clicks particular Article then i need to pass article id into articledetails.aspx page...
when i am trying to click particular article its not working...
when articlelist page is loaded if catid is 1 then url like this http:local/mysite/Articlelist/1

when i am click one article then url like http:local/mysite/Articlelist/Articleinfo/10 its a problem....if i am manualy given a url like http:local/mysite/Articleinfo/10 - its working...How to solve this problem...Give me a suggestions plz?


global.asax file:

void RegisterRoutes(RouteCollection routes)
{
routes.MapPageRoute("", "Articlelist/{catid}", "~/ArticlesList.aspx");
routes.MapPageRoute("", "Articleinfo/{artid}", "~/articledetails.aspx");
}