in web.config you can define the authentication for users. In the following section only for you allow the authentication and deny for others.
<authorization>
<allow users="dinesh_ahuja"/>
<deny users="*"/>
</authorization>
There is also a <location> tag that you can use to specify a particular file or directory to which settings wrapped by that tag, within the <configuration> section.
Actually that mechanism is not an easy step to work on. You may explore a lot related to that.