C#

private void button1_Click(object sender, EventArgs e)
       {
           Image bmp = new Bitmap(panel1.Width, panel1.Height);
           var gg = Graphics.FromImage(bmp);
           var rect = panel1.RectangleToScreen(panel1.ClientRectangle);
           gg.CopyFromScreen(rect.Location, Point.Empty, panel1.Size);
           bmp.Save("Test.jpg", ImageFormat.Jpeg);
           Graphics g = panel1.CreateGraphics();
           g.Clear(Color.White);
       }

using (Image bmp = new Bitmap(panel1.Width, panel1.Height))
    {
    using (Graphics gg = Graphics.FromImage(bmp))
        {
        Rectangle rect = panel1.RectangleToScreen(panel1.ClientRectangle);
        gg.CopyFromScreen(rect.Location, Point.Empty, panel1.Size);
        bmp.Save(@"D:\Temp\AAATest.jpg", ImageFormat.Jpeg);
        using (Graphics g = panel1.CreateGraphics())
            {
            g.Clear(Color.White);
            }
        }
    }

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.IO;
using System.Drawing.Imaging;

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

        float PointX = 0;
        float PointY = 0;

        float LastX = 0;
        float LastY = 0;

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

        private void panel1_Paint(object sender, PaintEventArgs e)
        {
            Graphics G = panel1.CreateGraphics();
            G.DrawLine(Pens.Black, PointX, PointY, LastX, LastY);
            LastX = PointX;
            LastY = PointY;
        }

        private void button1_Click(object sender, EventArgs e)
        {
            using (Image bmp = new Bitmap(panel1.Width, panel1.Height))
            {
                using (Graphics gg = Graphics.FromImage(bmp))
                {
                    Rectangle rect = panel1.RectangleToScreen(panel1.ClientRectangle);
                    gg.CopyFromScreen(rect.Location, Point.Empty, panel1.Size);
                    bmp.Save(@"AAATest.jpg", ImageFormat.Jpeg);
                    using (Graphics g = panel1.CreateGraphics())
                    {
                        g.Clear(Color.White);
                    }
                }
            }
        }
        private void panel1_MouseDown_1(object sender, MouseEventArgs e)
        {
            LastX = e.X;
            LastY = e.Y;

        }

        private void panel1_MouseMove_1(object sender, MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Left)
            {
                PointX = e.X;
                PointY = e.Y;
                panel1_Paint(this, null);

            }
        }
    
    }

}

private void tmrImageUpdate_Tick(object sender, EventArgs e)
        {   

            var img = new Bitmap(this.Height, this.Width);
            var grph = Graphics.FromImage(img);
            grph.CopyFromScreen((Cursor.Position.X-(pbImageRelay.Height/2)),(Cursor.Position.Y-(pbImageRelay.Width / 2)), 0, 0, img.Size);
            pbImageRelay.Image = img;
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            Rectangle resolution = Screen.PrimaryScreen.Bounds;

            tmrImageUpdate.Tick += tmrImageUpdate_Tick;
            tmrImageUpdate.Enabled = true;
            tmrImageUpdate.Start();
        }

MyForm mf = new MyForm();
mf.Show();

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

        private void btnStart_Click(object sender, EventArgs e)
        {
            comboBox1.Items.Add("Combo Item");
        }
    }

    public class GetComboItem
    {
        public GetComboItem()
        {
            ComboBox cmbItm = Application.OpenForms["Form1"].Controls.Find("comboBox1", true)[0] as ComboBox;            
            MessageBox.Show(cmbItm.Text);
        }
    }

m_Geometry.TryGetAnglesForPosition(intersectionPoint, _name).IfSome(result.Add);

m_Geometry.TryGetAnglesForPosition(intersectionPoint, _name).Match(
    point => result.Add(point),
    () => Logger.LogWarning(Name, $"Cannot determine angle for position '{intersectionPoint}' corresponding to pixel '{pixel}'."));

if (m_Geometry.TryGetAnglesForPosition(intersectionPoint, _name) is { IsSome: true } angle)
{
    angle.IfSome(result.Add);
}
else
{
    Logger.LogWarning(Name, $"Cannot determine angle for position '{intersectionPoint}' corresponding to pixel '{pixel}'.");
}

public static class OptionTExtensions
{
    public static void Deconstruct<T>(this Option<T> option, bool isSome, T value)
    {
        isSome = option.IsSome;
        value = isSome ? (T)option : default;
    }
}
...
var (isSome, point) = m_Geometry.TryGetAnglesForPosition(intersectionPoint, _name);
if (isSome)
{
    result.Add(point);
}
else
{
    Logger.LogWarning(Name, $"Cannot determine angle for position '{intersectionPoint}' corresponding to pixel '{pixel}'.");
}