using System;

public class Program

{

    public static void Main()

    {

        var labelOne = new LabelOne()

        {

            ProductName = "Test 1"

        };

        var labelTwo = new LabelTwo()

        {

            ProductName = "Test 2"

        };

        var printer = new PrintService();

        printer.PrintLabel<ILabelTwo>(labelTwo);

    }

}

​

public class PrintService {

    public void PrintLabel<T>(T obj) {

        if (obj as ILabelOne is not null) {

            PrintLabelOne(obj as ILabelOne);

        } else if (obj as ILabelTwo is not null) {

            PrintLabelTwo(obj as ILabelTwo);

        } else {

            Console.WriteLine("Unknown");

        }

    }

    private void PrintLabelOne(ILabelOne obj) {

        Console.WriteLine($"Let's go print Label One with product name {obj.ProductName}");

    }

    private void PrintLabelTwo(ILabelTwo obj) {

        Console.WriteLine($"Let's go print Label Two with product name {obj.ProductName}");

    }

}

​

public interface IBaseLabel {

    public string PrinterName { get; init; }

}

​

public interface ILabelOne : IBaseLabel {

    public string ProductName { get; init; }

}

​

public interface ILabelTwo : IBaseLabel {

    public string ProductName { get; init; }

}

​

struct LabelOne : ILabelOne

{

    public string PrinterName { get; init; }

    public string ProductName { get; init; }

}

​

struct LabelTwo : ILabelTwo

{

    public string ProductName { get; init; }

    public string PrinterName { get; init; }

}

​