如何访问主表单的成员

Question

I am only learning C# and I am trying to make a 2D game. I am at the stage where I have my Form1 set up with a 'PictureBox' for the player and the start of a player class:

class Player
{
    private string _name;
    private int _health;

    internal Player(string name, int health = 100)
    {
        _name = name;
        _health = health;
    }

    int X = 0;

    internal void Draw()
    {
        updateInput();

        Draw();
    }

    internal void updateInput()
    {
        if(Keyboard.IsKeyDown(Key.Right))
            X = 1;
        else if (Keyboard.IsKeyDown(Key.Left))
            X = -1;
        else
            X = 0; 
    }
}

There is a PictureBox "pb_play" which contains the character's sprite on the main form. I tried setting its access modifier to public but that did not help. I want to change the position of the character by whatever the X value becomes. So I was trying to essentially access that member of the form the class.

I was attempting to do this inside the draw method, so it would update the input, then after that it would set the position, and then repeat the Draw method, looping constantly.

If there is a better way though, feel free to educate me. How can I fix this?

EDIT: Okay, I moved the methods into the UI, as mentioned by a comment. Here is what I have, but the sprite refuses to move:

public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
        Draw();
    }

    int X = 0;

    internal void Draw()
    {
        updateInput();

        pb_play.Location = new Point((pb_play.Location.X + X), 0);

        Draw();
    }

    internal void updateInput()
    {
        if (Keyboard.IsKeyDown(Key.Right))
            X = 5;
        else if (Keyboard.IsKeyDown(Key.Left))
            X = -5;
        else
            X = 0;
    }
}

Answer 1

I used a timer to fix the issue:

internal void Draw()
    {
        pb_play.Location = new Point((pb_play.Location.X + X), (pb_play.Location.Y + Y));
    }

    internal void updateInput()
    {
        if (Keyboard.IsKeyDown(Key.Right))
            X = 1;
        else if (Keyboard.IsKeyDown(Key.Left))
            X = -1;
        else
            X = 0;

        if (Keyboard.IsKeyDown(Key.Up))
            Y = -1;
        else if (Keyboard.IsKeyDown(Key.Down))
            Y = 1;
        else
            Y = 0;
    }

    private void timer1_Tick(object sender, EventArgs e)
    {
        updateInput();
        Draw();
    }