C#

[DllImport("advapi32.DLL", SetLastError=true)]
        public static extern int LogonUser(string lpszUsername, string lpszDomain, string lpszPassword, int dwLogonType,
            int dwLogonProvider, ref IntPtr phToken);

private void button4_Click(object sender, EventArgs e)
        {
            WindowsIdentity wid_current = WindowsIdentity.GetCurrent();
            WindowsImpersonationContext wic = null;
            try
            {
                IntPtr admin_token = new IntPtr();
               
                if (LogonUser("bob2\apple", "abcd.dyndns.org:1234","password",9, 0, ref admin_token) != 0)
                {   
                    wic = new WindowsIdentity(admin_token).Impersonate();

                    // NOT SURE ABOUT THIS BIT.....
                    File.Copy(@"", @"",
                        true);
                    MessageBox.Show("Copy Succeeded");
                }
                else
                {
                    MessageBox.Show("Copy Failed");
                }
             }
            catch(Exception se)
            {
                int ret = Marshal.GetLastWin32Error();
                MessageBox.Show(ret.ToString(), "Error code: " + ret.ToString());
                MessageBox.Show(se.Message);
            }
            finally
            {
                if (wic != null)
                    wic.Undo();
            }
           
        }

Hi all,
I'm creating an application that will allow me to draw lines with the mouse and then save them to a file in a graphical format. By dint of trying and trying I have come to the code.

The last problem that I can not solve is that I can only save the 'background' of the image but not the drawed shape.

The program consists of a PictureBox1 and a button1, drawing with the left mouse button, closes the shape with the right button and save the.

Thanks in advance to those who want to give me a tip.

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.Drawing.Imaging;
using System.Drawing.Drawing2D;

namespace WindowsFormsApplication1
{
    public partial class Form1 : Form
    {
        Bitmap bm;
        Graphics g;
        GraphicsPath path = new GraphicsPath();

        Pen redPen;
        Pen blackPen1;
        Pen blackPen2;
        Pen orangePen;

        public Form1()
        {
            InitializeComponent();

            g = pictureBox1.CreateGraphics();

            redPen = new Pen(Color.Red, 2);
            blackPen1 = new Pen(Color.Black, 1);
            blackPen2 = new Pen(Color.Black, 2);
            orangePen = new Pen(Color.Orange, 1);

            bm = new Bitmap(pictureBox1.Width, pictureBox1.Height);
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            pictureBox1.Paint += new System.Windows.Forms.PaintEventHandler(this.pictureBox1_Paint);
            pictureBox1.MouseDown += new System.Windows.Forms.MouseEventHandler(this.pictureBox1_MouseDown);
            Shown += Form1_Shown;
        }

        ///////////////////////
        private void Form1_Shown(Object sender, EventArgs e)
        {
        }

        private List<Point> polygonPoints = new List<Point>();

        ///////////////////////
        private void pictureBox1_MouseDown(object sender, MouseEventArgs e)
        {
            switch (e.Button)
            {
                case MouseButtons.Left:
                    polygonPoints.Add(new Point(e.X, e.Y));

                    if (polygonPoints.Count > 1)
                    {
                        path.AddLine(polygonPoints[polygonPoints.Count - 2], polygonPoints[polygonPoints.Count - 1]);
                        g.DrawPath(redPen, path);
                    }
                    break;

                case MouseButtons.Right:
                    if (polygonPoints.Count > 2)
                    {
                        path.CloseAllFigures();

                        g.DrawPath(redPen, path);
                        g.FillPath(new SolidBrush(Color.Orange), path);
                    }
                    break;
            }
        }
        private void pictureBox1_Paint(object sender, PaintEventArgs e)
        {
            Graphics g = Graphics.FromImage(bm);

            // Draw grid
            for (int i = 0; i < pictureBox1.Width; i += 10) g.DrawLine(blackPen1, i, pictureBox1.Height, i, 0);
            for (int i = 0; i < pictureBox1.Height; i += 10) g.DrawLine(blackPen1, 0, i, pictureBox1.Width, i);
            g.DrawLine(blackPen2, 0, pictureBox1.Height - 90, pictureBox1.Width, pictureBox1.Height - 90);
            
            //g.Dispose();

            e.Graphics.DrawImageUnscaled(bm, 0, 0);
        }

        private void button1_Click(object sender, EventArgs e)
        {
            bm.Save("c:\\test.png", ImageFormat.Png);
        }
    }
}

static void Main(string[] args)
{
    // create an array of 100 million random integers
    Random r = new Random(Environment.TickCount);
    int[] numbers = new int[100000000];
    for (int index = 0; index < numbers.Length; index++)
    {
        numbers[index] = r.Next();
    }

    // find number divisible by 7 using basic iteration
    Stopwatch sw = Stopwatch.StartNew();
    int count = 0;
    foreach (int number in numbers) if (number % 7 == 0) count++;
    Console.WriteLine("Simple Iteration {0} : {1}", count, sw.ElapsedMilliseconds);

    // now do the same in LINQ
    sw = Stopwatch.StartNew();
    var x = from g in numbers where g % 7 == 0 select g;
    count = x.Count();
    Console.WriteLine("LINQ Query {0} : {1}", count, sw.ElapsedMilliseconds);

    // now using just count
    sw = Stopwatch.StartNew();
    int z = numbers.Count(g => g % 7 == 0);
    Console.WriteLine("Count Query {0} : {1}", z, sw.ElapsedMilliseconds);

    Console.ReadLine();
}