How do I pass the captured screen shot to a imagelist on another form in C#?

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C#

I'm developing an application which takes a screenshot an loads to a imagelist on another form.After I run the application the 2nd the captured image is not saved to the image list on the other form and I don't see if the screenshot got captured or not. Any solutions?

What I have tried:

This is my code to capture the screenshot.

public partial class Form1 : Form
   {
       Point startPos;
       Point currentpos;
       bool drawing;

       public Form1()
       {
           this.WindowState = FormWindowState.Maximized;
           this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None;
           this.BackColor = Color.White;
           this.Opacity = 0.75;
           this.Cursor = Cursors.Cross;
           this.MouseDown += Form1_MouseDown;
           this.MouseMove += Form1_MouseMove;
           this.MouseUp += Form1_MouseUp;
           this.Paint += Form1_Paint;
           this.KeyDown += Form1_KeyDown;
           this.DoubleBuffered = true;


       }

       private void Form1_MouseMove(object sender, MouseEventArgs e)
       {
           currentpos = e.Location;
           if (drawing) this.Invalidate();
       }

       private void Form1_KeyDown(object sender, KeyEventArgs e)
       {
           if (e.KeyCode == Keys.Escape)
           {
               this.DialogResult = System.Windows.Forms.DialogResult.Cancel;
               this.Close();
           }
       }

       public Rectangle GetRectangle()
       {
           return new Rectangle(
               Math.Min(startPos.X, currentpos.X),
               Math.Min(startPos.Y, currentpos.Y),
               Math.Abs(startPos.X - currentpos.X),
               Math.Abs(startPos.Y - currentpos.Y));
       }

       private void Form1_Paint(object sender, PaintEventArgs e)
       {
           if (drawing) e.Graphics.DrawRectangle(Pens.Red, GetRectangle());
       }

       private void Form1_MouseUp(object sender, MouseEventArgs e)
       {
           this.DialogResult = System.Windows.Forms.DialogResult.OK;
           this.Close();
       }

       private void Form1_MouseDown(object sender, MouseEventArgs e)
       {
           currentpos = startPos = e.Location;
           drawing = true;
       }
       private void InitializeComponent()
       {
           this.SuspendLayout();


           this.ClientSize = new System.Drawing.Size(284, 261);
           this.Name = "Form1";
           this.ShowInTaskbar = false;
           this.Load += new System.EventHandler(this.Form1_Load);
           this.ResumeLayout(false);

       }

This is my code for imagelist

public partial class Display : Form
    {
        [DllImport("user32.dll")]
        public static extern bool RegisterHotKey(IntPtr hWnd, int id, int fsModifiers, int vlc);

#pragma warning disable CS0626 // Method, operator, or accessor is marked external and has no attributes on it
        [DllImport("user32.dll")]
        public static extern bool UnregisterHotKey(IntPtr hWnd, int id);
#pragma warning restore CS0626 // Method, operator, or accessor is marked external and has no attributes on it

        private const int TAKE_SNAP_HOTKEY_ID = 1;

        private ScreenCapture objScreenCapture;
        private int snapCount;
        private List<Bitmap> snaps;
       

        public Display()
        {
            InitializeComponent();

            objScreenCapture = new ScreenCapture();
            snapCount = 0;
            snaps = new List<Bitmap>();

            RegisterHotKey(this.Handle, TAKE_SNAP_HOTKEY_ID, 6, (int)Keys.Z);

        }

        protected override void WndProc(ref Message m)
        {
            if (m.Msg == 0x0312 &&  m.WParam.ToInt32() == TAKE_SNAP_HOTKEY_ID )
            {
                TakeSnap();
            }
            base.WndProc(ref m);
        }

        private void takeSnapToolStripMenuItem_click(object sender, EventArgs e)
        {
            TakeSnap();
        }

        private void setBoundsToolStripMenuItem_click(object sender, EventArgs e)
        {
            objScreenCapture.SetCanvas();

        }
        private void TakeSnap()
        {
            var snap = objScreenCapture.GetSnapShot();
            snaps.Add(snap);
            AddTopreview(snap);
           
          
            
        }

        private void AddTopreview(object snap1)
        {
            throw new NotImplementedException();
        }

        private void AddTopreview(Bitmap snap)
        {

            imageList1.Images.Add(snap);
            listView1.Items.Add(new ListViewItem("Snap_" + (++snapCount), imageList1.Images.Count - 1)).EnsureVisible();
        }
        private void SaveAsImagesToolStripMenuItem_Click(object sender, EventArgs e)
        {
            uti.SaveAsImages(snaps);
        }

        private void SaveAsWordToolStripMenuItem_Click(object sender, EventArgs e)
        {
            uti.SaveAsWord(snaps);
        }

        private void MainWindow_FormClosing(object sender, FormClosingEventArgs e)
        {
            UnregisterHotKey(this.Handle, TAKE_SNAP_HOTKEY_ID);
        }