How to configure Authentication in IIS

This is a step for asking Authentication at each time of running your website from IIS.
You can follow these step for Enable or Disable Authentication in IIS.
 
You want like this Popup window or you want to avoid this popup window, you can follow these steps.

Step 1:

Go to the Authentication tab. Double Click it.

Step 2 :

If you want show Authentication popup window you should enable Windows Authentication is Enabled and Anonymous Authentication should be Disabled and
you want to hide the Authentication popup  
you should Disabled Windows Authentication and Anonymous Authentication should be Enabled.