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using System;
using System.Collections.Generic;
using System.Text.Json;
using System.Text.Json.Serialization;

namespace Poly
{
    public abstract class BaseClass
    {
        public string Hello { get; } = "Hello";

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// Based on: https://swiftcoder.wordpress.com/2008/11/25/constructing-a-billboard-matrix/
public static Matrix CreateBillboard(Vector3 position, Matrix view)
{
    var result = Matrix.Identity;
    result.Translation = position;
    result.M11 = view.M11;
    result.M12 = view.M21;
    result.M13 = view.M31;

    result.M21 = view.M12;

roy-t

So C# is an object oriented (OO) programming language. I'm assuming you're used to OO languages and might not have worked with procedural or functional programming languages. So I will try to explain everything from an OO point of view.

As you well know in an Object Oriented programming language you have objects. Take the following example:

public class Window
{
	private bool open;

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MetersPerSecond speed = 5.0f;
Seconds elapsed = 1.0f / 60.0f
Meters distance = speed * elapsed;

public struct Meters
{
    public Meters(float value)
    {
        this.Value = value;
    }

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This guide will provide you with a workaround for using XNA in Visual Studio 2017. This will solve problems with the target files and Microsoft.Build.Framework.dll such as: Error loading pipeline assembly "C:\Program Files (x86)\Reference Assemblies\Microsoft\Framework\.NETFramework\v4.0\Microsoft.Build.Framework.dll"

1. Download a modified version of the XNA vsix: https://mxa.codeplex.com/
2. Unzip XNA Game Studio 4.0.vsix and replace the <Installation /> tag in extension.vsixmanifest with this:

 <Installation InstalledByMsi="false">
    <InstallationTarget Version="[12.0,16.0)" Id="Microsoft.VisualStudio.VSWinDesktopExpress" />
    <InstallationTarget Version="[12.0,16.0)" Id="Microsoft.VisualStudio.Pro" />