C# Rendering Loop [closed]

I kind of need help understanding how rendering graphics works in C#. I have a java background and I've made a basic game engine with custom rendering that I use for all of my projects. After trying to adopt some principles from Java of making a game loop in C#, I've pretty much hit a dead end and need some help figuring out why the form window won't show up.

using System; using System.Collections.Generic; using System.ComponentModel; using System.Data; using System.Drawing; using System.Media; using System.Linq; using System.Text; using System.Windows.Forms;

namespace GameEngine { public partial class CoreEngine : Form { public Timer timer1 = new Timer();

    public CoreEngine()
    {
        InitializeComponent();
        this.Size = new Size(700, 500);
        this.StartPosition = FormStartPosition.CenterScreen;
        this.BackColor = Color.Black;
        this.DoubleBuffered = true;
        this.Text = "GameEngine in C#";
        //timer1.Tick += new EventHandler(update);
        //timer1.Interval = 1000 / 60;
        //timer1.Start();
        loop();
    }

    public void loop()
    {
        while (true)
        {
            update();
            this.Refresh();
        }
    }

    public void update()
    {
        //this.Refresh();
        xLoc += xVel;
        yLoc += yVel;

        if (xLoc > this.Size.Width - 65)
        {
            xVel *= -1;
        }
        else if (xLoc < 0)
        {
            xVel *= -1;
        }
        if (yLoc > this.Size.Height - 95)
        {
            yVel *= -1;
        }
        else if (yLoc < 0)
        {
            yVel *= -1;
        }
        Console.WriteLine("{0} and {1}", xLoc, yLoc);
    }

    public int xLoc = 50, yLoc = 50, xVel = 5, yVel = 5;

    protected override void OnPaint(PaintEventArgs e)
    {
        Graphics g = e.Graphics;
        g.DrawString("Hello, World", new Font("Arial", 24), new SolidBrush(Color.White), 300, 300);
        g.FillRectangle(new SolidBrush(Color.Purple), xLoc, yLoc, 50, 50);
    }
}

}