Show me the code to make my own dns server in Asp.Net Core

However, I can guide you through the process of creating a simple DNS server using an existing library called `dnscore`. This is not built on ASP.NET Core, but it's a popular and powerful .NET DNS server that you can use as an alternative to implement some basic functionality of your own custom DNS solution.

First, make sure you have the `dnscore` library installed: https://github.com/DNSCoreProject/Dnscore

You can use NuGet Package Manager to install it via the following command in your terminal: `Install-Package dnscore`

Next, create a new C# console application and add the DNSCore library to it. Here's an example of how you can use `dnscore` to create a simple recursive resolver:

`csharp

using System;

using Dnscore.Core.Dns; // Import the necessary namespaces here for dNSCore libraries (DNScorer, QueryResult and Question)

using Dnscore.Resolver;

using System.Threading.Tasks; // For async/await keywords

using System.Net; // For IPAddress and IPEndPoint classes

class Program : IDisposable { // Your class should implement the 'IDisposable' interface to release unmanaged resources properly when your application exits

private QueryResult _result;

private DnscoreResolver _resolver; // Create an instance of the 'DnscoreResolver' class to handle recursive queries.

public Program() { // Constructor initializes your DNS server and sets up listeners for incoming requests

_resolver = new DnscoreResolver();

}

async Task RunAsync() { // Main method for your application that sets up the event listeners and starts listening to incoming queries on a specified IP address. Replace '12345' with any available port number

var listener = new UdpListener(IPAddress.Any, 12345); // Set up a UDP listner to receive queries on the specified port

_resolver.MessageReceived += MessageHandler; // Register an event handler for incoming messages, i.e., DNS requests from clients

await listener.StartAsync(); // Start listening to queries on the specified IP and port number

}

private void MessageHandler(object sender, UdpReceivedEventArgs e) { // Handles incoming DNS queries from clients. Use dNSCore to process the query and send a response

var message = new Question(e.Buffer); // Parse incoming DNS request from client's buffer using 'Question' class in dNSCore library

var response = await _resolver.ResolveAsync(message, TimeSpan.FromSeconds(5)); // Use 'DnscoreResolver' class to process the query and resolve it

if (response != null) { // If a valid response is obtained, send the response back to client.

await e.Socket.SendAsync(new QueryResult(message, response).ToByteArray(), SocketFlags.None); // Use 'QueryResult' class to format the DNS query result and return it as a byte array

}

} // Configure your application settings, such as logging or exception handling, if desired. Then call 'RunAsync' method to start the server in Main()

public void Dispose(){ // Release unmanaged resources when your application exits by implementing IDisposable interface. Replace 'yourResource' with the name of any resource that needs disposing in this example

_resolver?.Dispose(); // Disposes dNSCore resolver object to release its resources. Make sure the '?' operator is used before any call made on '_resolver', as it's a nullable reference type in C# 9 and above.

// Dispose of other resources if required, e.g., listener or socket objects using 'using' statement: 'using (var listener = new UdpListener(IPAddress.Any, 12345)) {...}'

}

} // End of Program class definition here

` This example demonstrates how to create a simple recursive DNS server using `dnscore`. Keep in mind that this is only the tip of the iceberg when it comes to implementing your own custom DNS solution. If you're looking for more advanced functionality like authoritative name servers, dynamic updates or load balancing, consider using existing solutions such as PowerDNS or BIND.