Whatsapp not showing contacts - Android Lollipop 5.1

One of my audience asked me that Whatsapp not showing contacts. Instead just replying, I want to write a post to make it clear for all the audience. Whatsapp messenger is good at reading Address Book and showing Contacts.
But Why this problem arises is that some of your contacts are invisible. You may wonder that "I can see all my contact list, but you are saying invisible?". In brief I am saying that Whatsapp has no permissions to see some of your contacts. That's why some of your contacts are not listed in your Whatsapp messenger. Don't bother about this, you are just 3 steps away from getting your contacts listed.
Before following these steps,

1.Make sure your friends phone Numbers(which they use for whatsapp) are in your address book.

Whatsapp not showing contacts - Follow these steps:

By following these steps you are able to add some contacts which are not shown by Whatsapp.

1.Go to Contacts Help:

Go to Contacts Tab in you Whatsapp messenger, scroll down to the bottom. You'll find "Contacts Help", Just click on it.

2.Finding Invisible contacts:

To find Invisible contacts, just tap on "Show invisible Contacts" button at bottom. After this action, you can see some of invisible contacts. Now it's time to add them to Whatsapp contact list.

3.Adding Invisible contacts to your whatsapp contacts:

Just Below that you can find "Use all contacts not just visible ones" with a check box beside it. Now click on that option to add those contacts to your Whatsapp.

Go to : Contacts tab » Whatsapp Menu » Click Refresh

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