Print screen not working when minimized/shortcut key fails

Quote:

I use this code to make to print screen my screen, its working but my problem is when I minimize the application I can not use the shortcut key , any help?

private void button1_Click(object sender, EventArgs e)
        {
                       
            Bitmap bitmap = new Bitmap(Screen.PrimaryScreen.Bounds.Width,
                                  Screen.PrimaryScreen.Bounds.Height);
            Graphics graphics = Graphics.FromImage(bitmap as Image);
            graphics.CopyFromScreen(0, 0, 0, 0, bitmap.Size);
            var date = DateTime.Now.ToString("MMddyyHmmss");
            bitmap.Save(@"C:\Users\Public\Pictures" + date + ".jpg");
        }

        private void Form1_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.KeyCode == Keys.F12)
            {
                button1.PerformClick();
    
            }
        }