Csharp/CSharp Tutorial/GUI Windows Forms/Form Event

Содержание

1 All form events
2 Cancel Form Closing event
3 Form Key event
4 Form life time event: Closing, Load, Closed, Activated, Deactivate
5 Form mouse move event
6 Form Mouse Up event
7 Form size changed event handler
8 Paint event
9 Paint one forms with two paint event handler
10 Paint two forms with one paint event handler
11 React to form resize event

All form events

using System;
using System.Collections.Generic;
using System.ruponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
public partial class Form1 : Form
{
    public Form1()
    {
        InitializeComponent();
    }
    private void Form1_Activated(object sender, EventArgs e)
    {
        Console.WriteLine("Activated");
    }
    private void Form1_AutoSizeChanged(object sender, EventArgs e)
    {
        Console.WriteLine("Autosizechanged");
       
    }
    private void Form1_AutoValidateChanged(object sender, EventArgs e)
    {
        Console.WriteLine("AutoValidateChanged");
    }
    private void Form1_BackColorChanged(object sender, EventArgs e)
    {
        Console.WriteLine("BackColorChanged");
    }
    private void Form1_BackgroundImageChanged(object sender, EventArgs e)
    {
        Console.WriteLine("BackgroundImageChanged");
    }
    private void Form1_BackgroundImageLayoutChanged(object sender, EventArgs e)
    {
        Console.WriteLine("BackgroundImageLayoutChanged");
    }
    private void Form1_BindingContextChanged(object sender, EventArgs e)
    {
        Console.WriteLine("BindingContextChanged");
    }
    private void Form1_CausesValidationChanged(object sender, EventArgs e)
    {
        Console.WriteLine("CausesValidationChanged");
    }
    private void Form1_ChangeUICues(object sender, UICuesEventArgs e)
    {
        Console.WriteLine("ChangeUICues");
    }
    private void Form1_Click(object sender, EventArgs e)
    {
        Console.WriteLine("Click");
    }
    private void Form1_ContextMenuStripChanged(object sender, EventArgs e)
    {
        Console.WriteLine("ContextMenuStripChanged");
    }
    private void Form1_ControlAdded(object sender, ControlEventArgs e)
    {
        Console.WriteLine("ControlAdded");
    }
    private void Form1_ControlRemoved(object sender, ControlEventArgs e)
    {
        Console.WriteLine("ControlRemoved");
    }
    private void Form1_CursorChanged(object sender, EventArgs e)
    {
        Console.WriteLine("CursorChanged");
    }
    private void Form1_Deactivate(object sender, EventArgs e)
    {
        Console.WriteLine("Deactivate");
    }
    private void Form1_DockChanged(object sender, EventArgs e)
    {
        Console.WriteLine("DockChanged");
    }
    private void Form1_DoubleClick(object sender, EventArgs e)
    {
        Console.WriteLine("DoubleClick");
    }
    private void Form1_DragDrop(object sender, DragEventArgs e)
    {
        Console.WriteLine("DragDrop");
     
    }
    private void Form1_DragEnter(object sender, DragEventArgs e)
    {
        Console.WriteLine("DragEnter");
    }
    private void Form1_DragLeave(object sender, EventArgs e)
    {
        Console.WriteLine("DragLeave");
    }
    private void Form1_DragOver(object sender, DragEventArgs e)
    {
        Console.WriteLine("DragOver");
    }
    private void Form1_EnabledChanged(object sender, EventArgs e)
    {
        Console.WriteLine("EnabledChanged");
    }
    private void Form1_Enter(object sender, EventArgs e)
    {
        Console.WriteLine("Enter");
    }
    private void Form1_FontChanged(object sender, EventArgs e)
    {
        Console.WriteLine("FontChanged");
    }
    private void Form1_ForeColorChanged(object sender, EventArgs e)
    {
        Console.WriteLine("ForeColorChanged");
    }
    private void Form1_FormClosed(object sender, FormClosedEventArgs e)
    {
        Console.WriteLine("FormClosed");
    }
    private void Form1_FormClosing(object sender, FormClosingEventArgs e)
    {
        Console.WriteLine("FormClosing");
    }
    private void Form1_GiveFeedback(object sender, GiveFeedbackEventArgs e)
    {
        Console.WriteLine("GiveFeedback");
    }
    private void Form1_HelpButtonClicked(object sender, CancelEventArgs e)
    {
        Console.WriteLine("HelpButtonClicked");
    }
    private void Form1_HelpRequested(object sender, HelpEventArgs hlpevent)
    {
        Console.WriteLine("HelpRequested");
    }
    private void Form1_ImeModeChanged(object sender, EventArgs e)
    {
        Console.WriteLine("ImeModeChanged");
    }
    private void Form1_InputLanguageChanged(object sender, InputLanguageChangedEventArgs e)
    {
        Console.WriteLine("InputLanguageChanged");
    }
    private void Form1_InputLanguageChanging(object sender, InputLanguageChangingEventArgs e)
    {
        Console.WriteLine("InputLanguageChanging");
    }
    private void Form1_KeyDown(object sender, KeyEventArgs e)
    {
        Console.WriteLine("KeyDown");
    }
    private void Form1_KeyPress(object sender, KeyPressEventArgs e)
    {
        Console.WriteLine("KeyPress");
    }
    private void Form1_KeyUp(object sender, KeyEventArgs e)
    {
        Console.WriteLine("KeyUp");
    }
    private void Form1_Layout(object sender, LayoutEventArgs e)
    {
        Console.WriteLine("Layout");
    }
    private void Form1_Leave(object sender, EventArgs e)
    {
        Console.WriteLine("Leave");
    }
    private void Form1_Load(object sender, EventArgs e)
    {
        Console.WriteLine("Load");
    }
    private void Form1_LocationChanged(object sender, EventArgs e)
    {
        Console.WriteLine("LocationChanged");
    }
    private void Form1_MarginChanged(object sender, EventArgs e)
    {
        Console.WriteLine("MarginChanged");
    }
    private void Form1_MaximizedBoundsChanged(object sender, EventArgs e)
    {
        Console.WriteLine("MaximizedBoundsChanged");
    }
    private void Form1_MaximumSizeChanged(object sender, EventArgs e)
    {
        Console.WriteLine("MAximumSizeChanged");
    }
    private void Form1_MdiChildActivate(object sender, EventArgs e)
    {
        Console.WriteLine("MdiChildActivate");
    }
    private void Form1_MenuComplete(object sender, EventArgs e)
    {
        Console.WriteLine("MenuComplete");
    }
    private void Form1_MenuStart(object sender, EventArgs e)
    {
        Console.WriteLine("MenuStart");
    }
    private void Form1_MinimumSizeChanged(object sender, EventArgs e)
    {
        Console.WriteLine("MinimumSizeChanged");
    }
    private void Form1_MouseCaptureChanged(object sender, EventArgs e)
    {
        Console.WriteLine("MouseCaptureChanged");
    }
    private void Form1_MouseClick(object sender, MouseEventArgs e)
    {
        Console.WriteLine("MouseClick");
    }
    private void Form1_MouseDoubleClick(object sender, MouseEventArgs e)
    {
        Console.WriteLine("MouseDoubleClick");
    }
    private void Form1_MouseDown(object sender, MouseEventArgs e)
    {
        Console.WriteLine("MouseDown");
    }
    private void Form1_MouseEnter(object sender, EventArgs e)
    {
        Console.WriteLine("MouseEnter");
    }
    private void Form1_MouseHover(object sender, EventArgs e)
    {
        Console.WriteLine("MouseHover");
    }
    private void Form1_MouseLeave(object sender, EventArgs e)
    {
        Console.WriteLine("MouseLeave");
    }
    private void Form1_MouseMove(object sender, MouseEventArgs e)
    {
        Console.WriteLine("MouseMove");
    }
    private void Form1_MouseUp(object sender, MouseEventArgs e)
    {
        Console.WriteLine("MouseUp");
    }
    private void Form1_Move(object sender, EventArgs e)
    {
        Console.WriteLine("Move");
    }
    private void Form1_PaddingChanged(object sender, EventArgs e)
    {
        Console.WriteLine("PaddingChanged");
    }
    private void Form1_Paint(object sender, PaintEventArgs e)
    {
        Console.WriteLine("Paint");
    }
    private void Form1_ParentChanged(object sender, EventArgs e)
    {
        Console.WriteLine("ParentChanged");
    }
    private void Form1_QueryAccessibilityHelp(object sender, QueryAccessibilityHelpEventArgs e)
    {
        Console.WriteLine("QueryAccessibilityHelp");
    }
    private void Form1_QueryContinueDrag(object sender, QueryContinueDragEventArgs e)
    {
        Console.WriteLine("QueryContinueDrag");
    }
    private void Form1_RegionChanged(object sender, EventArgs e)
    {
        Console.WriteLine("RegionChanged");
    }
    private void Form1_Resize(object sender, EventArgs e)
    {
        Console.WriteLine("Resize");
    }
    private void Form1_ResizeBegin(object sender, EventArgs e)
    {
        Console.WriteLine("ResizeBegin");
    }
    private void Form1_ResizeEnd(object sender, EventArgs e)
    {
        Console.WriteLine("ResizeEnd");
    }
    private void Form1_RightToLeftChanged(object sender, EventArgs e)
    {
        Console.WriteLine("RightToLeftChanged");
    }
    private void Form1_RightToLeftLayoutChanged(object sender, EventArgs e)
    {
        Console.WriteLine("RightToLeftLayoutChanged");
    }
    private void Form1_Scroll(object sender, ScrollEventArgs e)
    {
        Console.WriteLine("Scroll");
    }
    private void Form1_Shown(object sender, EventArgs e)
    {
        Console.WriteLine("Shown");
    }
    private void Form1_SizeChanged(object sender, EventArgs e)
    {
        Console.WriteLine("SizeChanged");
    }
    private void Form1_StyleChanged(object sender, EventArgs e)
    {
        Console.WriteLine("StyleChanged");
    }
    private void Form1_SystemColorsChanged(object sender, EventArgs e)
    {
        Console.WriteLine("SystemColorsChanged");
    }
    private void Form1_TextChanged(object sender, EventArgs e)
    {
        Console.WriteLine("TextChanged");
    }
    private void Form1_Validated(object sender, EventArgs e)
    {
        Console.WriteLine("Validated");
    }
    private void Form1_Validating(object sender, CancelEventArgs e)
    {
        Console.WriteLine("Validating");
    }
    private void Form1_VisibleChanged(object sender, EventArgs e)
    {
        Console.WriteLine("VisibleChanged");
    }
}
partial class Form1
{
    private void InitializeComponent()
    {
        this.button1 = new System.Windows.Forms.Button();
        this.SuspendLayout();
        // 
        // button1
        // 
        this.button1.Location = new System.Drawing.Point(87, 79);
        this.button1.Name = "button1";
        this.button1.Size = new System.Drawing.Size(75, 23);
        this.button1.TabIndex = 0;
        this.button1.Text = "button1";
        // 
        // Form1
        // 
        this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
        this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
        this.ClientSize = new System.Drawing.Size(292, 266);
        this.Controls.Add(this.button1);
        this.Name = "Form1";
        this.Text = "Form1";
        this.CursorChanged += new System.EventHandler(this.Form1_CursorChanged);
        this.RightToLeftLayoutChanged += new System.EventHandler(this.Form1_RightToLeftLayoutChanged);
        this.QueryContinueDrag += new System.Windows.Forms.QueryContinueDragEventHandler(this.Form1_QueryContinueDrag);
        this.Deactivate += new System.EventHandler(this.Form1_Deactivate);
        this.Load += new System.EventHandler(this.Form1_Load);
        this.BackgroundImageLayoutChanged += new System.EventHandler(this.Form1_BackgroundImageLayoutChanged);
        this.RightToLeftChanged += new System.EventHandler(this.Form1_RightToLeftChanged);
        this.DragLeave += new System.EventHandler(this.Form1_DragLeave);
        this.InputLanguageChanged += new System.Windows.Forms.InputLanguageChangedEventHandler(this.Form1_InputLanguageChanged);
        this.Validating += new System.ruponentModel.CancelEventHandler(this.Form1_Validating);
        this.BackgroundImageChanged += new System.EventHandler(this.Form1_BackgroundImageChanged);
        this.MouseDoubleClick += new System.Windows.Forms.MouseEventHandler(this.Form1_MouseDoubleClick);
        this.DragEnter += new System.Windows.Forms.DragEventHandler(this.Form1_DragEnter);
        this.ControlAdded += new System.Windows.Forms.ControlEventHandler(this.Form1_ControlAdded);
        this.FontChanged += new System.EventHandler(this.Form1_FontChanged);
        this.MaximizedBoundsChanged += new System.EventHandler(this.Form1_MaximizedBoundsChanged);
        this.AutoSizeChanged += new System.EventHandler(this.Form1_AutoSizeChanged);
        this.Paint += new System.Windows.Forms.PaintEventHandler(this.Form1_Paint);
        this.VisibleChanged += new System.EventHandler(this.Form1_VisibleChanged);
        this.BindingContextChanged += new System.EventHandler(this.Form1_BindingContextChanged);
        this.HelpButtonClicked += new System.ruponentModel.CancelEventHandler(this.Form1_HelpButtonClicked);
        this.EnabledChanged += new System.EventHandler(this.Form1_EnabledChanged);
        this.MouseDown += new System.Windows.Forms.MouseEventHandler(this.Form1_MouseDown);
        this.ContextMenuStripChanged += new System.EventHandler(this.Form1_ContextMenuStripChanged);
        this.Scroll += new System.Windows.Forms.ScrollEventHandler(this.Form1_Scroll);
        this.MouseLeave += new System.EventHandler(this.Form1_MouseLeave);
        this.MouseClick += new System.Windows.Forms.MouseEventHandler(this.Form1_MouseClick);
        this.Validated += new System.EventHandler(this.Form1_Validated);
        this.ParentChanged += new System.EventHandler(this.Form1_ParentChanged);
        this.Resize += new System.EventHandler(this.Form1_Resize);
        this.ControlRemoved += new System.Windows.Forms.ControlEventHandler(this.Form1_ControlRemoved);
        this.Shown += new System.EventHandler(this.Form1_Shown);
        this.AutoValidateChanged += new System.EventHandler(this.Form1_AutoValidateChanged);
        this.SizeChanged += new System.EventHandler(this.Form1_SizeChanged);
        this.DoubleClick += new System.EventHandler(this.Form1_DoubleClick);
        this.Activated += new System.EventHandler(this.Form1_Activated);
        this.Enter += new System.EventHandler(this.Form1_Enter);
        this.Layout += new System.Windows.Forms.LayoutEventHandler(this.Form1_Layout);
        this.MouseUp += new System.Windows.Forms.MouseEventHandler(this.Form1_MouseUp);
        this.StyleChanged += new System.EventHandler(this.Form1_StyleChanged);
        this.ForeColorChanged += new System.EventHandler(this.Form1_ForeColorChanged);
        this.DragDrop += new System.Windows.Forms.DragEventHandler(this.Form1_DragDrop);
        this.MouseEnter += new System.EventHandler(this.Form1_MouseEnter);
        this.MdiChildActivate += new System.EventHandler(this.Form1_MdiChildActivate);
        this.Leave += new System.EventHandler(this.Form1_Leave);
        this.MouseMove += new System.Windows.Forms.MouseEventHandler(this.Form1_MouseMove);
        this.MinimumSizeChanged += new System.EventHandler(this.Form1_MinimumSizeChanged);
        this.Move += new System.EventHandler(this.Form1_Move);
        this.MouseCaptureChanged += new System.EventHandler(this.Form1_MouseCaptureChanged);
        this.FormClosed += new System.Windows.Forms.FormClosedEventHandler(this.Form1_FormClosed);
        this.PaddingChanged += new System.EventHandler(this.Form1_PaddingChanged);
        this.KeyPress += new System.Windows.Forms.KeyPressEventHandler(this.Form1_KeyPress);
        this.ChangeUICues += new System.Windows.Forms.UICuesEventHandler(this.Form1_ChangeUICues);
        this.DockChanged += new System.EventHandler(this.Form1_DockChanged);
        this.GiveFeedback += new System.Windows.Forms.GiveFeedbackEventHandler(this.Form1_GiveFeedback);
        this.ImeModeChanged += new System.EventHandler(this.Form1_ImeModeChanged);
        this.Click += new System.EventHandler(this.Form1_Click);
        this.SystemColorsChanged += new System.EventHandler(this.Form1_SystemColorsChanged);
        this.QueryAccessibilityHelp += new System.Windows.Forms.QueryAccessibilityHelpEventHandler(this.Form1_QueryAccessibilityHelp);
        this.FormClosing += new System.Windows.Forms.FormClosingEventHandler(this.Form1_FormClosing);
        this.RegionChanged += new System.EventHandler(this.Form1_RegionChanged);
        this.KeyUp += new System.Windows.Forms.KeyEventHandler(this.Form1_KeyUp);
        this.MarginChanged += new System.EventHandler(this.Form1_MarginChanged);
        this.TextChanged += new System.EventHandler(this.Form1_TextChanged);
        this.ResizeBegin += new System.EventHandler(this.Form1_ResizeBegin);
        this.HelpRequested += new System.Windows.Forms.HelpEventHandler(this.Form1_HelpRequested);
        this.LocationChanged += new System.EventHandler(this.Form1_LocationChanged);
        this.KeyDown += new System.Windows.Forms.KeyEventHandler(this.Form1_KeyDown);
        this.BackColorChanged += new System.EventHandler(this.Form1_BackColorChanged);
        this.InputLanguageChanging += new System.Windows.Forms.InputLanguageChangingEventHandler(this.Form1_InputLanguageChanging);
        this.MenuStart += new System.EventHandler(this.Form1_MenuStart);
        this.MouseHover += new System.EventHandler(this.Form1_MouseHover);
        this.ResizeEnd += new System.EventHandler(this.Form1_ResizeEnd);
        this.DragOver += new System.Windows.Forms.DragEventHandler(this.Form1_DragOver);
        this.CausesValidationChanged += new System.EventHandler(this.Form1_CausesValidationChanged);
        this.MenuComplete += new System.EventHandler(this.Form1_MenuComplete);
        this.MaximumSizeChanged += new System.EventHandler(this.Form1_MaximumSizeChanged);
        this.ResumeLayout(false);
    }
    private System.Windows.Forms.Button button1;
}
public class FormEventAll
{
    [STAThread]
    static void Main()
    {
        Application.EnableVisualStyles();
        Application.Run(new Form1());
        MessageBox.Show("Click OK to finish");
    }
}

Cancel Form Closing event

using System;
using System.Drawing;
using System.Collections;
using System.ruponentModel;
using System.Windows.Forms;
using System.Data;
public class FormClosingEventCancle : System.Windows.Forms.Form
{
  private System.ruponentModel.Container components = null;
  public FormClosingEventCancle()
  {
    InitializeComponent();
    this.Closing += new System.ruponentModel.CancelEventHandler(this.FormClosingEventCancle_Closing);
  }
  protected override void Dispose( bool disposing )
  {
    if( disposing )
    {
      if (components != null) 
      {
        components.Dispose();
      }
    }
    base.Dispose( disposing );
  }
  private void InitializeComponent()
  {
    this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
    this.ClientSize = new System.Drawing.Size(280, 177);
  }
  [STAThread]
  static void Main() 
  {
    Application.Run(new FormClosingEventCancle());
  }
  private void FormClosingEventCancle_Closing(object sender, System.ruponentModel.CancelEventArgs e)
  {
    DialogResult dr = MessageBox.Show("Do you REALLY want to close this app?",
      "Closing event!", MessageBoxButtons.YesNo);
    if(dr == DialogResult.No)
      e.Cancel = true;
    else
      e.Cancel = false;    
  }
}

Form Key event

using System;
using System.Drawing;
using System.Collections;
using System.ruponentModel;
using System.Windows.Forms;
using System.Data;
public class FormMouseKeyEvent : System.Windows.Forms.Form
{
  private System.ruponentModel.Container components = null;
  public FormMouseKeyEvent()
  {
    this.KeyUp += new KeyEventHandler(OnKeyUp);
    InitializeComponent();
    CenterToScreen();
  }
  protected override void Dispose( bool disposing )
  {
    if( disposing )
    {
      if (components != null) 
      {
        components.Dispose();
      }
    }
    base.Dispose( disposing );    
  }
  private void InitializeComponent()
  {
    this.ruponents = new System.ruponentModel.Container();
    this.Size = new System.Drawing.Size(300,300);
    this.Text = "Form1";
  }
  [STAThread]
  static void Main() 
  {
    Application.Run(new FormMouseKeyEvent());
  }
  public void OnKeyUp(object sender, KeyEventArgs e)
  {
    MessageBox.Show(e.KeyCode.ToString(), "Key Pressed!");
  }
}

Form life time event: Closing, Load, Closed, Activated, Deactivate

using System;
using System.Drawing;
using System.Collections;
using System.ruponentModel;
using System.Windows.Forms;
using System.Data;
public class FormLifeTimeEvent : System.Windows.Forms.Form
{
  private System.ruponentModel.Container components = null;
  public FormLifeTimeEvent()
  {
    InitializeComponent();
    this.Closing += new System.ruponentModel.CancelEventHandler(this.FormLifeTimeEvent_Closing);
    this.Load += new System.EventHandler(this.FormLifeTimeEvent_Load);
    this.Closed += new System.EventHandler(this.FormLifeTimeEvent_Closed);
    this.Activated += new System.EventHandler(this.FormLifeTimeEvent_Activated);
    this.Deactivate += new System.EventHandler(this.FormLifeTimeEvent_Deactivate);
  }
  protected override void Dispose( bool disposing )
  {
    if( disposing )
    {
      if (components != null) 
      {
        components.Dispose();
      }
    }
    base.Dispose( disposing );
  }
  private void InitializeComponent()
  {
    this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
    this.ClientSize = new System.Drawing.Size(280, 177);
  }
  [STAThread]
  static void Main() 
  {
    Application.Run(new FormLifeTimeEvent());
  }
  private void FormLifeTimeEvent_Closing(object sender, System.ruponentModel.CancelEventArgs e)
  {
    Console.WriteLine("Closing event");
  }
  private void FormLifeTimeEvent_Load(object sender, System.EventArgs e) { 
      Console.WriteLine("Load event"); 
  }
  private void FormLifeTimeEvent_Activated(object sender, System.EventArgs e) { 
      Console.WriteLine("Activate event"); 
  }
  private void FormLifeTimeEvent_Deactivate(object sender, System.EventArgs e) { 
      Console.WriteLine("Deactivate event"); 
  }
  
  private void FormLifeTimeEvent_Closed(object sender, System.EventArgs e) { 
      Console.WriteLine("Closed event"); 
  }
}

Form mouse move event

using System;
using System.Drawing;
using System.Collections;
using System.ruponentModel;
using System.Windows.Forms;
using System.Data;
public class FormMouseMoveEvent : System.Windows.Forms.Form
{
  private System.ruponentModel.Container components = null;
  public FormMouseMoveEvent()
  {
    this.MouseMove += new MouseEventHandler(OnMouseMove);
    InitializeComponent();
  }
  protected override void Dispose( bool disposing )
  {
    if( disposing )
    {
      if (components != null) 
      {
        components.Dispose();
      }
    }
    base.Dispose( disposing );    
  }
  private void InitializeComponent()
  {
    this.ruponents = new System.ruponentModel.Container();
    this.Size = new System.Drawing.Size(300,300);
    this.Text = "Form1";
  }
  [STAThread]
  static void Main() 
  {
    Application.Run(new FormMouseMoveEvent());
  }
  protected void OnMouseMove(object sender, MouseEventArgs e)
  {
    this.Text = "Current Pos: (" + e.X + ", " + e.Y + ")";
  }
}

Form Mouse Up event

using System;
using System.Drawing;
using System.Collections;
using System.ruponentModel;
using System.Windows.Forms;
using System.Data;
public class FormMouseUpEvent : System.Windows.Forms.Form
{
  private System.ruponentModel.Container components = null;
  public FormMouseUpEvent()
  {
    this.MouseUp += new MouseEventHandler(OnMouseUp);
    InitializeComponent();
  }
  protected override void Dispose( bool disposing )
  {
    if( disposing )
    {
      if (components != null) 
      {
        components.Dispose();
      }
    }
    base.Dispose( disposing );    
  }
  private void InitializeComponent()
  {
    this.ruponents = new System.ruponentModel.Container();
    this.Size = new System.Drawing.Size(300,300);
    this.Text = "Form1";
  }
  [STAThread]
  static void Main() 
  {
    Application.Run(new FormMouseUpEvent());
  }
  protected void OnMouseUp(object sender, MouseEventArgs e)
  {
    // Which mouse button was clicked?
    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!");
  }
}

Form size changed event handler

using System;
using System.Drawing;
using System.Windows.Forms;
public class ControlDynamicSizeLocation : Form
{
  private Button btnShow = new Button();
  private Label lbl = new Label();
  int xButtonSize, yButtonSize;
  public ControlDynamicSizeLocation()
  {
    btnShow.Parent = this;
    btnShow.Text = "Show Button Properties";
    Size = new Size(400,400);
    xButtonSize = (int)(Font.Height * .75) * btnShow.Text.Length;
    yButtonSize = Font.Height * 2;
    btnShow.Size = new Size(xButtonSize, yButtonSize);
    btnShow.Click += new System.EventHandler(btnShow_Click);
    lbl.Text = "Control Size and Location - Dynamic";
    lbl.AutoSize = true;
    lbl.Parent = this;
    OnResize(EventArgs.Empty);
  }
  protected override void OnResize(EventArgs e)
  {
    base.OnResize(e);
    int xPosition = (int)(this.ClientSize.Width / 2) - (int)(xButtonSize / 2);
    int yPosition = (int)(this.ClientSize.Height / 2) - (int)(yButtonSize / 2);
    btnShow.Location = new Point(xPosition, yPosition);
  }
  static void Main() 
  {
    Application.Run(new ControlDynamicSizeLocation());
  }
  private void btnShow_Click(object sender, EventArgs e)
  {
    Console.WriteLine("Button Bottom:" + btnShow.Bottom.ToString());
    Console.WriteLine("Button Top:" + btnShow.Top.ToString() );
    Console.WriteLine("Button Left:" + btnShow.Left.ToString() );
    Console.WriteLine("Button Right:" + btnShow.Right.ToString() );
    Console.WriteLine("Button Location:" + btnShow.Location.ToString() );
    Console.WriteLine("Button Width:" + btnShow.Width.ToString() );
    Console.WriteLine("Button Height:" + btnShow.Height.ToString() );
    Console.WriteLine("Button Size:" + btnShow.Size.ToString() );
    Console.WriteLine("Button ClientSize:" + btnShow.ClientSize.ToString() );
    Console.WriteLine("Font:" + btnShow.Font.ToString());
  }
}

Paint event

using System;
using System.Drawing;
using System.Collections;
using System.ruponentModel;
using System.Windows.Forms;
using System.Data;
public class PaintForm : System.Windows.Forms.Form
{
  private System.ruponentModel.Container components;
  public PaintForm()
  {
    InitializeComponent();
  }
  protected override void Dispose( bool disposing )
  {
    if( disposing )
    {
      if (components != null) 
      {
        components.Dispose();
      }
    }
    base.Dispose( disposing );
  }
  private void InitializeComponent()
  {
    this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
    this.ClientSize = new System.Drawing.Size(292, 273);
    this.Text = "DataGridExample";
    this.Resize += new System.EventHandler(this.PaintForm_Resize);
    this.Paint += new System.Windows.Forms.PaintEventHandler(this.PaintForm_Paint);
    }
  [STAThread]
  static void Main() 
  {
    Application.Run(new PaintForm());
  }
  private void PaintForm_Resize(object sender, System.EventArgs e)
  {
    Invalidate();
    Console.WriteLine("Resize");
  }
  private void PaintForm_Paint(object sender, System.Windows.Forms.PaintEventArgs e)
  {
    Graphics g = e.Graphics;
    g.DrawString("Text", 
      new Font("Times New Roman", 20), 
      new SolidBrush(Color.Black), 
      this.DisplayRectangle);    
  }
}

Paint one forms with two paint event handler

using System;
using System.Drawing;
using System.Windows.Forms;
   
class TwoPaintHandlers
{
     public static void Main()
     {
          Form form      = new Form();
          form.Text      = "Two Paint Handlers";
          form.BackColor = Color.White;
          form.Paint    += new PaintEventHandler(PaintHandler1);
          form.Paint    += new PaintEventHandler(PaintHandler2);
   
          Application.Run(form);
     }
     static void PaintHandler1(object objSender, PaintEventArgs pea)
     {
          Form     form = (Form)objSender;
          Graphics graphics = pea.Graphics;
   
          graphics.DrawString("First Paint Event Handler", form.Font, 
                          Brushes.Black, 0, 0);
     }
     static void PaintHandler2(object objSender, PaintEventArgs pea)
     {
          Form     form = (Form)objSender;
          Graphics graphics = pea.Graphics;
   
          graphics.DrawString("Second Paint Event Handler", form.Font, 
                          Brushes.Black, 0, 100);
     }
}

Paint two forms with one paint event handler

using System;
using System.Drawing;
using System.Windows.Forms;
   
class PaintTwoForms
{
     static Form form1, form2;
   
     public static void Main()
     {
          form1 = new Form();
          form2 = new Form();
   
          form1.Text      = "First Form";
          form1.BackColor = Color.White;
          form1.Paint    += new PaintEventHandler(MyPaintHandler);
   
          form2.Text      = "Second Form";
          form2.BackColor = Color.White;
          form2.Paint    += new PaintEventHandler(MyPaintHandler);
          form2.Show();
   
          Application.Run(form1);
     }
     static void MyPaintHandler(object objSender, PaintEventArgs pea)
     {
          Form     form = (Form)objSender;
          Graphics graphics = pea.Graphics;
          string   str;
   
          if(form == form1)
               str = "Hello from the first form";
          else
               str = "Hello from the second form";
   
          graphics.DrawString(str, form.Font, Brushes.Black, 0, 0);
     }
}

React to form resize event

using System;
using System.Drawing;
using System.Collections;
using System.ruponentModel;
using System.Windows.Forms;
using System.Data;
public class ResizeForm : System.Windows.Forms.Form
{
  private System.ruponentModel.Container components;
  public ResizeForm()
  {
    InitializeComponent();
  }
  protected override void Dispose( bool disposing )
  {
    if( disposing )
    {
      if (components != null) 
      {
        components.Dispose();
      }
    }
    base.Dispose( disposing );
  }
  private void InitializeComponent()
  {
    this.AutoScaleBaseSize = new System.Drawing.Size(5, 13);
    this.ClientSize = new System.Drawing.Size(292, 273);
    this.Resize += new System.EventHandler(this.ResizeForm_Resize);

  }
  [STAThread]
  static void Main() 
  {
    Application.Run(new ResizeForm());
  }
  private void ResizeForm_Resize(object sender, System.EventArgs e)
  {
    Invalidate();
    Console.WriteLine("Resize");
  }
}

Csharp/CSharp Tutorial/GUI Windows Forms/Form Event

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All form events

Cancel Form Closing event

Form Key event

Form life time event: Closing, Load, Closed, Activated, Deactivate

Form mouse move event

Form Mouse Up event

Form size changed event handler

Paint event

Paint one forms with two paint event handler

Paint two forms with one paint event handler

React to form resize event

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