asp.net routing issue

I am getting routing issue, i have posts page that has posts according to the category , and the individual post page. since the both the routs has two querystrings they are conflicting each other, any idea to solve the issue thanks

routes.MapPageRoute( "Posts", "{Category}/{PageNo}/", "~/posts.aspx", true, new RouteValueDictionary { { "PageNo", "" } } ); routes.MapPageRoute( "post", "{postname}-{postid}/", "~/post.aspx" );