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private void Form1_Load(object sender, EventArgs e)
{
this.button1.Click += new EventHandler(button_Click);
this.button2.Click += new EventHandler(button_Click);
this.button3.Click += new EventHandler(button_Click);
}
void button_Click(object sender, EventArgs e)
{
Button btn = (Button)sender;
MessageBox.Show(btn.Text);
}