Firestore authentication in C#

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C#

I'm using firestore in c#.
Now I want to login First using email and password.
Then I want to access collection.

//SETUP

I've created user in authentication page.
I've setup firestore rule like this so only authenticated user can access collections.


service cloud.firestore {

match /databases/{database}/documents {

match /{document=**} {

allow read, write: if request.auth != null;

}

}

}

now I want to first login in C#. then use credentials to access my collections.

What I have tried:

I'm currently using Google.cloud.Firestore. But I'm unable to find find proper authentication code.