Get Event sender in event handler
using System;
using System.Drawing;
using System.Windows.Forms;
class TwoButtons: Form
{
readonly Button btnLarger, btnSmaller;
readonly int cxBtn, cyBtn, dxBtn;
public static void Main()
{
Application.Run(new TwoButtons());
}
public TwoButtons()
{
ResizeRedraw = true;
cxBtn = 200;
cyBtn = 100;
dxBtn = 12;
btnLarger = new Button();
btnLarger.Parent = this;
btnLarger.Text = "&Larger";
btnLarger.Size = new Size(cxBtn, cyBtn);
btnLarger.Click += new EventHandler(ButtonOnClick);
btnSmaller = new Button();
btnSmaller.Parent = this;
btnSmaller.Text = "&Smaller";
btnSmaller.Size = new Size(cxBtn, cyBtn);
btnSmaller.Click += new EventHandler(ButtonOnClick);
OnResize(EventArgs.Empty);
}
protected override void OnResize(EventArgs ea)
{
base.OnResize(ea);
btnLarger.Location =
new Point(ClientSize.Width / 2 - cxBtn - dxBtn / 2,
(ClientSize.Height - cyBtn) / 2);
btnSmaller.Location =
new Point(ClientSize.Width / 2 + dxBtn / 2,
(ClientSize.Height - cyBtn) / 2);
}
void ButtonOnClick(object obj, EventArgs ea)
{
Button btn = (Button) obj;
if (btn == btnLarger)
{
Left -= (int)(0.1 * Width);
Top -= (int)(0.1 * Height);
Width += (int)(0.1 * Width);
Height += (int)(0.1 * Height);
}
else
{
Left += (int)(Width / 22f);
Top += (int)(Height / 22f);
Width -= (int)(Width / 11f);
Height -= (int)(Height / 11f);
}
}
}
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