Form size changed event handler : Form Event « GUI Windows Forms « C# / CSharp Tutorial

1. C# / CSharp Tutorial
2. GUI Windows Forms
3. Form Event

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());
  }
}

23.3.Form Event
	23.3.1.	Form size changed event handler
	23.3.2.	All form events
	23.3.3.	React to form resize event
	23.3.4.	Paint event
	23.3.5.	Paint two forms with one paint event handler
	23.3.6.	Paint one forms with two paint event handler
	23.3.7.	Form Mouse Up event
	23.3.8.	Form mouse move event
	23.3.9.	Form Key event
	23.3.10.	Form life time event: Closing, Load, Closed, Activated, Deactivate
	23.3.11.	Cancel Form Closing event
	23.3.12.	Form Paint event