Hi @lida daryani ,
You could consider using ASP.NET Core SignalR. It is an open-source library that simplifies adding real-time web functionality to apps. Real-time web functionality enables server-side code to push content to clients instantly. And the SignalR .NET client runs on any platform supported by ASP.NET Core. For example, Xamarin developers can use SignalR for building Android apps using Xamarin.Android 220.127.116.11 and later and iOS apps using Xamarin.iOS 18.104.22.168 and later.
You can refer to the official document and sample code to learn how to use it, such as this link: ASP.NET Core SignalR .NET Client.
Besides, you can also search online, there has multiple tutorials about using Asp.net core SignalR with Xamarin, like this: Xamarin.Android - Realtime App with SignalR ASP.Net Core.
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