C#

System.Diagnostics.Process process = new System.Diagnostics.Process();
process.StartInfo = new System.Diagnostics.ProcessStartInfo(command, commandLineArg);
process.StartInfo.WindowStyle = System.Diagnostics.ProcessWindowStyle.Hidden;
process.Start();

this.Show();
WindowState = FormWindowState.Normal;

private void ButtonClick(object sender, System.EventArgs e)
		{
			if((Button)sender == button1)
			{
				button1.BackColor = Color.Green;
				MessageBox.Show("button1 was clicked", "Form1");
			}
			else if((Button)sender == button2)
			{
				button2.BackColor = Color.Pink;
				MessageBox.Show("button2 was clicked", "Form1");
			}
			else if((Button)sender == button3)
			{
				button3.BackColor = Color.Blue;
				MessageBox.Show("button3 was clicked", "Form1");
			}
			else if((Button)sender == button4)
			{
				button4.BackColor = Color.Yellow;
				MessageBox.Show("button4 was clicked", "Form1");
			}
		}

private void button_Click(object sender, System.EventArgs e)
{
  Button b = sender as Button;
 
  if (b != null) // if null the event handler has been bound to a non-Button
  {
    // Reset all other Buttons
    foreach (Control c in this.Controls)
    {
      if (c is Button)
        c.BackColor = SystemColors.Control;
    }
    // Colorize the button pressed
    b.BackColor = Color.Red;
  }
}

Button btn = (Button) sender;
MessageBox.Show(btn.Text); // Display button's caption

SqlConnection conn = new SqlConnection(...);<br />
conn.Open();<br />
conn.Close();<br />
conn.Open();<br />
conn.Dispose();

SqlConnection conn = new SqlConnection(...);<br />
conn.Open();<br />
conn.Dispose();<br />
conn.Open();

SqlConnection conn = new SqlConnection(...);
conn.Open();
conn.Dispose();
conn.ConnectionString = "...";
conn.Open();
conn.Dispose();