using System;
using System.Drawing;
using System.Windows.Forms;
   
class BlockOut: Form
{
     bool      bBlocking, bValidBox;
     Point     ptBeg, ptEnd;
     Rectangle rectBox;
   
     public static void Main()
     {
          Application.Run(new BlockOut());
     }
     protected override void OnMouseDown(MouseEventArgs mea)
     {
          if (mea.Button == MouseButtons.Left)
          {
               ptBeg = ptEnd = new Point(mea.X, mea.Y);
   
               Graphics grfx = CreateGraphics();
               grfx.DrawRectangle(new Pen(ForeColor), Rect(ptBeg, ptEnd));
               grfx.Dispose();
   
               bBlocking = true;
          }
     }
     protected override void OnMouseMove(MouseEventArgs mea)
     {
          if (bBlocking)
          {
               Graphics grfx = CreateGraphics();
               grfx.DrawRectangle(new Pen(BackColor), Rect(ptBeg, ptEnd));
               ptEnd = new Point(mea.X, mea.Y);
               grfx.DrawRectangle(new Pen(ForeColor), Rect(ptBeg, ptEnd));
               grfx.Dispose();
               Invalidate();
          }
     }
     protected override void OnMouseUp(MouseEventArgs mea)
     {
          if (bBlocking && mea.Button == MouseButtons.Left)
          {
               Graphics grfx = CreateGraphics();
               rectBox = Rect(ptBeg, new Point(mea.X, mea.Y));
               grfx.DrawRectangle(new Pen(ForeColor), rectBox);
               grfx.Dispose();
   
               bBlocking = false;
               bValidBox = true;
               Invalidate();
          }
     }
     protected override void OnPaint(PaintEventArgs pea)
     {
          Graphics grfx = pea.Graphics;
   
          if (bValidBox)
               grfx.FillRectangle(new SolidBrush(ForeColor), rectBox);
   
          if (bBlocking)
               grfx.DrawRectangle(new Pen(ForeColor), Rect(ptBeg, ptEnd));
     }
     Rectangle Rect(Point ptBeg, Point ptEnd)
     {
          return new Rectangle(Math.Min(ptBeg.X, ptEnd.X),
                               Math.Min(ptBeg.Y, ptEnd.Y),
                               Math.Abs(ptEnd.X - ptBeg.X),
                               Math.Abs(ptEnd.Y - ptBeg.Y));
     }
}

    

   

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

public class Form1 : Form
{
   bool shouldPaint = false;
   public Form1() {
       InitializeComponent();
   }

   private void PainterForm_MouseDown( object sender, MouseEventArgs e )
   {
      shouldPaint = true;
   }

   private void PainterForm_MouseUp( object sender, MouseEventArgs e )
   {
      shouldPaint = false;
   }

   private void PainterForm_MouseMove( object sender, MouseEventArgs e )
   {
      if ( shouldPaint )
      {
         Graphics graphics = CreateGraphics();
         graphics.FillEllipse(new SolidBrush( Color.BlueViolet ), e.X, e.Y, 4, 4 );
         graphics.Dispose();
      }
   }
  private void InitializeComponent()
  {
     this.SuspendLayout();

     this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
     this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
     this.ClientSize = new System.Drawing.Size(184, 180);
     this.Name = "PainterForm";
     this.Text = "Painter";
     this.MouseDown += new System.Windows.Forms.MouseEventHandler(this.PainterForm_MouseDown);
     this.MouseUp += new System.Windows.Forms.MouseEventHandler(this.PainterForm_MouseUp);
     this.MouseMove += new System.Windows.Forms.MouseEventHandler(this.PainterForm_MouseMove);
     this.ResumeLayout(false);

  }
  [STAThread]
  static void Main()
  {
    Application.EnableVisualStyles();
    Application.Run(new Form1());
  }

}



           
          

   
 

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;

public class frmMouseButtons : System.Windows.Forms.Form {
    private System.Windows.Forms.Label lblLeftClick;
    private System.Windows.Forms.Label lblRightClick;
    private System.Windows.Forms.Label lblMiddleClick;
    private System.Windows.Forms.Label lblHover;
    public frmMouseButtons() {
        this.lblLeftClick = new System.Windows.Forms.Label();
        this.lblRightClick = new System.Windows.Forms.Label();
        this.lblMiddleClick = new System.Windows.Forms.Label();
        this.lblHover = new System.Windows.Forms.Label();
        this.SuspendLayout();

        this.lblLeftClick.Location = new System.Drawing.Point(8, 8);

        this.lblRightClick.Location = new System.Drawing.Point(8, 32);
        this.lblRightClick.Size = new System.Drawing.Size(100, 32);

        this.lblMiddleClick.Location = new System.Drawing.Point(8, 72);

        this.lblHover.Location = new System.Drawing.Point(8, 104);
        this.lblHover.MouseEnter += new System.EventHandler(this.lblHover_MouseEnter);
        this.lblHover.MouseHover += new System.EventHandler(this.lblHover_MouseHover);
        this.lblHover.MouseLeave += new System.EventHandler(this.lblHover_MouseLeave);

        this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
        this.ClientSize = new System.Drawing.Size(184, 198);
        this.Controls.AddRange(new System.Windows.Forms.Control[] {
                                      this.lblHover,
                                      this.lblMiddleClick,
                                      this.lblRightClick,
                                      this.lblLeftClick});
        this.MaximizeBox = false;
        this.ResumeLayout(false);

    }
    protected override void OnMouseDown(MouseEventArgs e) {
        switch (e.Button) {
            case (MouseButtons.Left):
                lblLeftClick.Text = "Left Click";
                break;
            case (MouseButtons.Middle):
                lblLeftClick.Text = "Middle Click";
                break;
            case (MouseButtons.Right):
                lblLeftClick.Text = "Right Click";
                break;
            case (MouseButtons.XButton1):
                lblLeftClick.Text = "XButton1 Click";
                break;
            case (MouseButtons.XButton2):
                lblLeftClick.Text = "XButton2 Click";
                break;
        }
        switch (e.Clicks) {
            case 1:
                lblMiddleClick.Text = "Single Click";
                break;
            case 2:
                lblMiddleClick.Text = "Double Click!";
                break;
            default:
                lblMiddleClick.Text = "Many clicks!";
                break;
        }
    }

    protected override void OnMouseWheel(MouseEventArgs e) {
        switch (e.Delta) {
            case -360:
                lblRightClick.Text = "One Rotation Reverse";
                break;
            case -720:
                lblRightClick.Text = "Two Rotations Reverse";
                break;
            case 360:
                lblRightClick.Text = "One Rotation Forward";
                break;
            case 720:
                lblRightClick.Text = "Two Rotations Forward";
                break;
            default:
                lblRightClick.Text = "Rotation wasn't full turn of wheel";
                break;
        }
    }


    protected void lblHover_MouseEnter(object sender, EventArgs e) {
        lblRightClick.Text = "One Rotation Forward";
        lblHover.Text = "Entering label";
        Cursor = Cursors.NoMove2D;
    }

    protected void lblHover_MouseHover(object sender, EventArgs e) {
        lblHover.Text = "Hovering over label";
        Cursor = Cursors.Hand;
        System.Diagnostics.Debug.WriteLine("hover");
    }

    protected void lblHover_MouseLeave(object sender, EventArgs e) {
        lblHover.Text = "Leaving label";
        Cursor = Cursors.Default;
    }
    [STAThread]
    static void Main() {
        Application.Run(new frmMouseButtons());
    }
}

    

   
 

using System;
using System.Windows.Forms;
using System.Drawing;

public class MainWindow : Form {
    public MainWindow() {
        Height = 300;
        Width = 500;
        this.MouseMove += new MouseEventHandler(MainForm_MouseMove);
        this.MouseUp += new MouseEventHandler(MainForm_MouseUp);
        this.KeyUp += new KeyEventHandler(MainForm_KeyUp);
    }
    protected void MainForm_MouseMove(object sender, MouseEventArgs e) {
        this.Text = string.Format("Current Pos: ({0}, {1})", e.X, e.Y);
    }

    protected void MainForm_MouseUp(object sender, MouseEventArgs e) {

        if (e.Button == MouseButtons.Left)
            MessageBox.Show("Left click!");
        if (e.Button == MouseButtons.Right)
            MessageBox.Show("Right click!");
        if (e.Button == MouseButtons.Middle)
            MessageBox.Show("Middle click!");
    }

    protected void MainForm_KeyUp(object sender, KeyEventArgs e) {
        MessageBox.Show(e.KeyCode.ToString(), "Key Pressed!");
    }
    public static void Main(string[] args) {
        Application.Run(new MainWindow());
    }
}

    

   


  using System;
  using System.Windows.Forms;
  using Microsoft.Win32;

  public class MyMessageFilter : IMessageFilter 
  {
    public bool PreFilterMessage(ref Message m) 
    {
      // Intercept the left mouse button down message.
      if (m.Msg == 513) 
      {
        Console.WriteLine("WM_LBUTTONDOWN is: " + m.Msg);
        return true;
      }
      return false;
    }
  }

  public class mainForm : System.Windows.Forms.Form
  {
    private MyMessageFilter msgFliter = new MyMessageFilter();

    public mainForm()
    {
      GetStats();
      Application.ApplicationExit += new EventHandler(Form_OnExit);
      Application.AddMessageFilter(msgFliter);    
    }

    [STAThread]
    static void Main() 
    {
      Application.Run(new mainForm());
    }

    private void GetStats()
    {
      Console.WriteLine(Application.CompanyName+ "  Company:");
      Console.WriteLine(Application.ProductName+ " App Name:");
      Console.WriteLine(Application.StartupPath);
    }

    // Event handlers.
    private void Form_OnExit(object sender, EventArgs evArgs) 
    {
      Console.WriteLine("Exit", "This app is dead...");
      Application.RemoveMessageFilter(msgFliter);
    }
  }


           
          

   
 

using System;
using System.Drawing;
using System.Windows.Forms;
   
class InstantiateHelloWorld
{
     public static void Main()
     {
          Form form   = new Form();
          form.Text   = "Instantiate " + form.Text;
          form.Paint += new PaintEventHandler(MyPaintHandler);
   
          Application.Run(form);
     }
     static void MyPaintHandler(object objSender, PaintEventArgs pea)
     {
          Form     form = (Form)objSender;
          Graphics graphics = pea.Graphics;
   
          graphics.DrawString("Hello from InstantiateHelloWorld!", 
                          form.Font, Brushes.Black, 0, 100);
     }
}

    

   

/*
Professional Windows GUI Programming Using C#
by Jay Glynn, Csaba Torok, Richard Conway, Wahid Choudhury, 
   Zach Greenvoss, Shripad Kulkarni, Neil Whitlow

Publisher: Peer Information
ISBN: 1861007663
*/
using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Text;

namespace KeyboardSample
{
    /// <summary>
    /// Summary description for KeyboardSample.
    /// </summary>
    public class KeyboardSample : System.Windows.Forms.Form
    {
      private System.Windows.Forms.TextBox textBox1;
      private System.Windows.Forms.TextBox textBox2;
      private System.Windows.Forms.GroupBox groupBox1;
      private System.Windows.Forms.Label label1;
      private System.Windows.Forms.GroupBox groupBox2;
      private System.Windows.Forms.Label label2;
        /// <summary>
        /// Required designer variable.
        /// </summary>
        private System.ComponentModel.Container components = null;

        public KeyboardSample()
        {
            //
            // Required for Windows Form Designer support
            //
            InitializeComponent();

            //
            // TODO: Add any constructor code after InitializeComponent call
            //
        }

        /// <summary>
        /// Clean up any resources being used.
        /// </summary>
        protected override void Dispose( bool disposing )
        {
            if( disposing )
            {
                if (components != null) 
                {
                    components.Dispose();
                }
            }
            base.Dispose( disposing );
        }

        #region Windows Form Designer generated code
        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
        {
         this.textBox1 = new System.Windows.Forms.TextBox();
         this.textBox2 = new System.Windows.Forms.TextBox();
         this.groupBox1 = new System.Windows.Forms.GroupBox();
         this.label1 = new System.Windows.Forms.Label();
         this.groupBox2 = new System.Windows.Forms.GroupBox();
         this.label2 = new System.Windows.Forms.Label();
         this.groupBox1.SuspendLayout();
         this.groupBox2.SuspendLayout();
         this.SuspendLayout();
         // 
         // textBox1
         // 
         this.textBox1.Location = new System.Drawing.Point(16, 24);
         this.textBox1.Name = "textBox1";
         this.textBox1.Size = new System.Drawing.Size(168, 20);
         this.textBox1.TabIndex = 5;
         this.textBox1.Text = "";
         this.textBox1.KeyDown += new System.Windows.Forms.KeyEventHandler(this.textBox1_KeyDown);
         // 
         // textBox2
         // 
         this.textBox2.Location = new System.Drawing.Point(16, 24);
         this.textBox2.Name = "textBox2";
         this.textBox2.Size = new System.Drawing.Size(168, 20);
         this.textBox2.TabIndex = 6;
         this.textBox2.Text = "";
         this.textBox2.KeyDown += new System.Windows.Forms.KeyEventHandler(this.textBox2_KeyDown);
         // 
         // groupBox1
         // 
         this.groupBox1.Controls.AddRange(new System.Windows.Forms.Control[] {
                                                                                this.label1,
                                                                                this.textBox1});
         this.groupBox1.Location = new System.Drawing.Point(8, 8);
         this.groupBox1.Name = "groupBox1";
         this.groupBox1.TabIndex = 7;
         this.groupBox1.TabStop = false;
         this.groupBox1.Text = "Key Monitor";
         // 
         // label1
         // 
         this.label1.Location = new System.Drawing.Point(16, 64);
         this.label1.Name = "label1";
         this.label1.Size = new System.Drawing.Size(168, 20);
         this.label1.TabIndex = 6;
         // 
         // groupBox2
         // 
         this.groupBox2.Controls.AddRange(new System.Windows.Forms.Control[] {
                                                                                this.textBox2,
                                                                                this.label2});
         this.groupBox2.Location = new System.Drawing.Point(8, 120);
         this.groupBox2.Name = "groupBox2";
         this.groupBox2.TabIndex = 8;
         this.groupBox2.TabStop = false;
         this.groupBox2.Text = "Keys Enumeration";
         // 
         // label2
         // 
         this.label2.Location = new System.Drawing.Point(16, 64);
         this.label2.Name = "label2";
         this.label2.Size = new System.Drawing.Size(168, 20);
         this.label2.TabIndex = 9;
         // 
         // KeyboardSample
         // 
         this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
         this.ClientSize = new System.Drawing.Size(216, 229);
         this.Controls.AddRange(new System.Windows.Forms.Control[] {
                                                                      this.groupBox2,
                                                                      this.groupBox1});
         this.Name = "KeyboardSample";
         this.Text = "KeyboardSample";
         this.groupBox1.ResumeLayout(false);
         this.groupBox2.ResumeLayout(false);
         this.ResumeLayout(false);

      }
        #endregion

        /// <summary>
        /// The main entry point for the application.
        /// </summary>
        [STAThread]
        static void Main() 
        {
            Application.Run(new KeyboardSample());
        }

      private void textBox1_KeyDown(object sender, System.Windows.Forms.KeyEventArgs e)
      {
         label1.Text = Convert.ToString(e.KeyValue);
      }

      private void textBox2_KeyDown(object sender, System.Windows.Forms.KeyEventArgs e)
      {
         StringBuilder sb = new StringBuilder();
         if(e.Shift) sb.Append("Shift, ");
         if(e.Alt) sb.Append("Alt, ");
         if(e.Control) sb.Append("Ctrl, ");
                    
         if(e.KeyCode==Keys.W||e.KeyCode==Keys.R||e.KeyCode==Keys.O||e.KeyCode==Keys.X)
         {
            sb.Append("Wrox Press!!");
         }
         else if(e.KeyCode==Keys.Escape&amp;&amp;e.Modifiers==(Keys.Shift|Keys.Alt))
         {
            sb.Append("Escape - that won&#039;t work!");
         }
         else if(e.KeyCode == Keys.C &amp;&amp; e.Modifiers==(Keys.Alt | Keys.Control))
         {
            sb.Append("CopyRight");
            textBox2.SelectedText = "CopyRight";
            textBox2.SelectionLength = 0;
         }
         else 
         {
            sb.Append(Convert.ToString(e.KeyData));
         }
         label2.Text = sb.ToString();
      }
    }
}