How to rewrite querystring url - asp.net

Question

Need help,
Assuming I have a site: http://mysite/test.aspx
and I passed a querystring like this: http://mysite/test.aspx?id=1234
How can I change the url in the address bar like this: http://mysite/1234
and how can I get the value of 1234? can I still use Request.QueryString["id"]?
I'm using C# asp.net.
Many thanks guys!

Answer 1

Just use Request.QueryString["id"] and if you want to change your url from http://mysite/test.aspx?id=1234 to http://mysite/1234 do the following:
If you're using ASP .NET 4 then do something like this:
routes.MapPageRoute("",
"mysite/1234",
"~/mysite/test.aspx?id=1234");
If you're using ASP .NET 3.5 or lower try to do this:
Browser.Url = new System.Uri("http://mysite/1234", System.UriKind.Absolute);

Answer 2

What you need is called URL Rewriting. There are multiple ways to do it depending on complexity of your application and URLs.
I worked on URL re-writing few years ago. We had a complicated system with even more complicated query string values.
I used Helicons ISAPI engine for rewriting. Avialable in both both paid and free version. Please look into it if your application demands it. You will need to write lots and lots and lots of RegEx though. But, overall amazing tool.
If you requirements are simple (i.e. to rewite a few pages), you can use free libraries such as urlrewriter which might help you and make your life easier if you want to rewrite for multiple pages in one shot.
At last, very simple and easy way to rewrite URLs: read this tutorial from Scott Gu and you will understand what you need to do:
http://weblogs.asp.net/scottgu/archive/2007/02/26/tip-trick-url-rewriting-with-asp-net.aspx
If you want those pretty URLs to be generated on it's own when you click on the hyperlink with your query-string value, you will definitely have to work at IIS level (which URL re-writing libraries will do for you).
I could have posted some sample code to do it but I thought the above tools and tutorial from Scott Gu will help you understand what you need to do and in a much better way.