using System.Windows.Forms;
namespace WindowsFormsApp
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private void checkBox1_KeyDown(object sender, KeyEventArgs e)
{
if (e.KeyCode == Keys.NumPad1)
{
checkBox1.Checked = checkBox1.Checked.Equals(false);
}
}
}
}