Multiple images in a picturebox

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C#

Windows

form

I'm a beginner in programming and I'm trying to learn it by myself.So I have to add 2 different images to a picturebox ( in this case a table and a chair that are linked to 2 toolstripbuttons). I need to place multiple tables and chairs so I can move them or remove them afterwards. But when I placed tables and want to add the chairs my tables disappear.
Is there also a way to save the locations of the images in the picturebox so when I reopen the project the placed images will be on their previous locations?

What I have tried:

This is the main form

<pre>namespace WORKSPACE
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        SPACE space;

        enum OPTION
        {
            PLACE,
            REMOVE,
            REPLACE
        }

        OPTION OPTIONS = OPTION.PLACE;

        Image figure;

        private void Form1_Load(object sender, EventArgs e)
        {
            
        }

        private void pLACEToolStripMenuItem_Click(object sender, EventArgs e)
        {
            OPTIONS = OPTION.PLACE;
        }

        private void rEMOVEToolStripMenuItem_Click(object sender, EventArgs e)
        {
            OPTIONS = OPTION.REMOVE;

        }

        private void rEPLACEToolStripMenuItem_Click(object sender, EventArgs e)
        {
            OPTIONS = OPTION.REPLACE;
        }

        private void pictureBox1_MouseMove(object sender, MouseEventArgs e)
        {
            toolStripStatusLabel1.Text = "X:" + e.X.ToString() + "Y:" + e.Y.ToString();
        }

        private void pictureBox1_MouseDown(object sender, MouseEventArgs e)
        {
            if (OPTIONS== OPTION.PLACE)
            {
                space.PLACE(e.X, e.Y);
            }
            else
                if (OPTIONS == OPTION.REPLACE)
            {
                space.REPLACE(e.X, e.Y);
            }
            else
                if (OPTIONS == OPTION.REMOVE)
            {
                space.REMOVE(e.X, e.Y);
            }
        }

        private void toolStripButton1_Click(object sender, EventArgs e)
        {
            figure = toolStripButton1.Image;
            space = new SPACE(pictureBox1.CreateGraphics(), figure);
        }

        private void toolStripButton2_Click(object sender, EventArgs e)
        {
            figure = toolStripButton2.Image;
            space = new SPACE(pictureBox1.CreateGraphics(), figure);
        }
    }
}
This is the class I created


using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Drawing;

namespace WORKSPACE
{
    class SPACE
    {
        int COUNTER = 0;
        
        
        Graphics G;
        List<Rectangle> SPACES;
        Rectangle MOUSE;
        Boolean STATUSREPLACE = false;
        int SPACECOUNTER;
        int DUMMY;
        Image figure;
        

        public SPACE(Graphics g,Image f)
        {
            G = g;
            figure = f;
          
            
            SPACES = new List<Rectangle>();
        }

        public void PLACE(int X, int Y)
        {
            COUNTER++;
            SPACES.Add(new Rectangle(X, Y, 20, 20));
            DRAWSPACE();
        }

        public void DRAWSPACE()
        {
            SPACETELLER = 1;
            G.Clear(Color.White);
            foreach (Rectangle r in SPACES)
            {
                G.DrawImage(figure,r.X,r.Y);
                SPACECOUNTER++;
            }
        }
        public void DRAWSPACECHAIR()
        {
            SPACECOUNTER = 1;
            G.Clear(Color.White);
            foreach (Rectangle r in SPACES)
            {
                G.DrawImage(figure, r.X, r.Y);
                SPACECOUNTER++;
            }
        }

        public void REPLACE(int X, int Y)
        {
            SPACECOUNTER = 1;
            MOUSE = new Rectangle(X, Y, 2, 2);
            foreach (Rectangle r in SPACES)
            {
                if (MOUSE.IntersectsWith(r))
                {
                    if (STATUSREPLACE == false)
                    {
                        SPACES.Remove(r);
                        STATUSREPLACE = true;
                        DUMMY = SPACECOUNTER;
                        return;
                    }
                }
                SPACECOUNTER++;
            }
            if (STATUSREPLACE == true)
            {
                SPACES.Insert(--DUMMY, new Rectangle(X, Y, 20, 20));
                STATUSREPLACE = false;
                DRAWSPACE();
                DRAWSPACECHAIR();
            }
        }
        public void REMOVE(int X, int Y)
        {
            SPACECOUNTER = 1;
            MOUSE = new Rectangle(X, Y, 2, 2);
            foreach (Rectangle r in SPACES)
            {
                if (MOUSE.IntersectsWith(r))
                {
                    
                    SPACES.Remove(r);
                    break;
                    
                }
                
            }
            DRAWSPACE();
            DRAWSPACECHAIR();
        }

    }  
}