How to automatically login to your application through cookie

Hello all,

I have created an asp.net inranet application using c#. I have a login form which i use to login. First time a user login his username password may be store somewhere (i think in cookies as my logic).  When a user visit the site second time, he should not ask a username and password by application. He should be login by using cookie (as my logic) which contain his uername and password. But many people say that storing password in cookie is not secure.

So how to achive the above functionality by securing username and password ??? Please reply immediately.

Thanks in advance.