Connect Xamarin app with RESTful Web Service - xamarin

I am new in the Xamarin area and I am trying to learn how to connect it with online database. I saw some tutorials which tell to connect it with RESTful Web Service but I have confused.
Does any one can tell any good tutorial or can give me some instructions how to connect it?

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Connect Xamarin application to local ADFS

I'm trying to create a simple Xamarin application that would need to use a local ADFS to identity the user. Indeed, I wrote an internal web application in ASP.NET Core but the client would like to have a light version as a mobile app, therefore, I need to authenticate the user the same way I do it for the web application: using ADFS 2019 + OAuth/OpenIdConnect.
However, I did some researches on Google and I find nothing talking about that specific case. Most articles concern Azure but I don't want to use Azure, I want to use a local ADFS.
Can anyone provide me with a link or some idea about the way to achieve this?
There's a set of good articles here that cover ADFS and OIDC.
The libraries are the same as the Azure ones - just the parameters are different.

Setting up Server Side and Client Side for Google Cloud Messaging

I am trying to make 2 applications which uses Google Cloud Messaging.
My goal is to make a one application Android IBM Worklight which can receive Push notifications (CLIENT-SIDE) and another application a Tomcat Server Java Servlet (SERVER-SIDE).
However, I have absolutely no experience in using Google Cloud Messaging and it is my first time using Android IBM Worklight as client-side.
So I was hoping someone could point me in the right direction that I so could have 1st application using tomcat server sending the Push notifications (SERVER-SIDE) and another application using IBM Worklight as (CLIENT-SIDE) to receive the push notification.
I have been finding tutorials regarding this but I am stuck at implementation.
This tutorial link gave me an idea on how to do server side since i am using tomcat server. However the client-side is code is not what I am looking for since I am using IBM Worklight inside.
Another tutorial link show me how the push notification works at IBM Worklight for both client and server side. However, as mention earlier my server side is Tomcat server at Eclipse thus I think that I can't using this tutorial for server side.
As for client side, I think can use this tutorial since it is IBM Worklight however it is not using Google Cloud Messaging.
I would appreciate someone help me..Thanks :)
The second tutorial has the information you need. If you have your Worklight server set up on Tomcat, just follow the tutorial and deploy the push adapter to that server.

Connecting a Windows Application to online database[Vb.Net]

Question 1 :
Hi, I'm new to "VB.Net" and programming. Me and my friend is developing a Windows Application in VB.NET and we wanted to connect to a online MySql database. We already did it in the same pc[localhost]. But we wanted to know wether is it possible to connect a online MySql database to Vb.net Windows Application (not a web application)?
Question 2:
What is the name used to call Windows Applications that are connected to a online server?
Some examples I know are Steam application and Facebook Messenger.
[Where you can download the application, install and log in to the server.]

"SSL handshake failure" Oracle ADF Mobile Webservice Integration

I am new to the Oracle ADF Mobile Application Development. I am trying to access the web service in my application.The web service is perfect as I had use it in my another Core Android application.
But when trying to use the same web service in Oracle ADF Mobile it gives me the following error:
SSL handshake failure
Here, I had also attached the screenshot of the emulator.
I don't get what is the issue.
Please help.Thanks in advance...:)
See if this helps:
http://docs.oracle.com/cd/E35521_01/doc.111230/e24475/security.htm#autoId18
Its from the documentation
Frank

Accessing a Google App Engine application from a Windows application using OAuth

We have an application built on top of the Google App Engine. We now need to write a Windows 7 tray application that accesses services provided by our GAE application. This implies that we need to first make an OAuth connection to our application, and we are finding it difficult to locate information about how to accomplish this.
We have already successfully used Google's OAuth2 API .net client to establish a trusted connection from our Windows application to the Google API, but this does not seem to also give us access to the Google App Engine which seems to live in a different part of the ether.
So first, I would like to ask, are we correct in our understanding that Google App Engine only supports OAuth 1.0 and does not support OAuth 2 as the rest of the Google API seems to support?
And second, (assuming the answer to the above is yes) does anyone know of any information or example code where someone has already made a successful OAuth 1.0 connection from a Windows .NET (C#) application to a Google App Engine application? It would be of great help to us to locate such an example.
Google App Engine supports just Oauth 1.0 and it is still an experimental feature.
Having to deal with a .NET C# application I would proceed in this way:
Get the DevDefined OAuth package
Look the ExampleConsumerSite here
Port in C# the relative simple step explained in Java or Python

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