Answer Posted / lily antony

This is implemented through Authentication and Authorisation

In the web.config file
set the Authentication tag as
<authentication mode="Forms">
<forms name="myforms" loginUrl="LoginPage.aspx" >
</forms>
</authentication>
This means you are using forms authentication and the login
page name is LoginPage.aspx.

and the autorisation tag as
<authorization>
<deny users="?"/>
</authorization>
This means deny unauthenticated users.

In the LoginPage's Authentication Logic use the following
code if the user is valid.
FormsAuthentication.RedirectFromLoginPage
(txt_UserName.Text, false);

In the logic of the Signout button use
FormsAuthentication.Signout();

In all innerpages set the following code in the pageload
Response.Expires = 0;
Response.CacheControl = "no-cache";

For complete explanation refer Forms Authentication and
authorization in msdn.

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