How to avoid showing folders in website name

Question

Hi All,

I have created a website, which works successfully. Now for eg, imagine that the name of my website is ABC. And I have many folders inside it I have many aspx pages and their relevant .cs pages. eg. I have folders such as E1, E2 etc.

when i say www.ABC.com/E1 all the contents inside the folder gets displayed, I want to avoid this.
What should I do so that whenever the some puts www.ABC.com/E1 it should not work, tats nothing should be displayed.

Thanks in advance

Regards
cmrhemalatha