How to append custom string after .aspx in URL in ASP.Net

I hv two pages default.aspx and readall.aspx

from default.aspx page i m redirecting to readall.aspx page like this

http://localhost:6999/slidestoday.com/blog/readall.aspx/abc-xyz~abc

above last part is used as id which i hv to use in my code;

I hv only one button in readall.aspx page nothing else.

When i click on this button it is redirecting to readall.aspx/readall.aspx 

Any help?????????????????????