private void RedBlueGreen_Click(object sender, EventArgs e) { if (PictureBox1.Image == null) { alert.Show(); } else { if (boolrbg == true) { RedButton.Show(); BlueButton.Show(); GreenButton.Show(); boolrbg = false; } else if (boolrbg == false) { RedButton.Hide(); BlueButton.Hide(); GreenButton.Hide(); boolrbg = true; } } }