public static AboutProgram GetInstance() { if (_instance == null) { _instance = new AboutProgram(); } return(_instance); }
private void aboutProgram_Click(object sender, EventArgs e) { Form aboutForm = AboutProgram.GetInstance(); if (!aboutForm.Visible) { aboutForm.Show(); } else { aboutForm.BringToFront(); } }
private void AboutProgram_FormClosing(object sender, FormClosingEventArgs e) { _instance = null; }