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Button btn1 = null;
Button btn2 = null;
Button btn3 = null;
private void Form1_Load(object sender, EventArgs e)
{
btn1 = new Button();
btn2 = new Button();
btn3 = new Button();
btn1.Size = new Size(150, 50);
btn2.Size = new Size(150, 50);
btn3.Size = new Size(150, 50);
btn1.Location = new Point(5, 5);
btn2.Location = new Point(btn1.Right + 5, 5);
btn3.Location = new Point(btn2.Right + 5, 5);
btn1.Text = "Red";
btn2.Text = "0, 255, 0";
btn3.Text = "Transparent";
this.Controls.AddRange(new Control[] { btn1, btn2, btn3 });
this.btn1.Click += new EventHandler(btn_Click);
this.btn2.Click += new EventHandler(btn_Click);
this.btn3.Click += new EventHandler(btn_Click);
}
void btn_Click(object sender, EventArgs e)
{
this.TransparencyKey = Color.FromKnownColor(KnownColor.Control);
}