protected internal static CheckinListForm Instance() { if (_instance == null) { _instance = new CheckinListForm(); } return(_instance); }
private void btnCheckinList_Click(object sender, EventArgs e) { if (!panel3.Controls.Contains(CheckinListForm.Instance())) { panel3.Controls.Add(CheckinListForm._instance); CheckinListForm._instance.Dock = DockStyle.Fill; CheckinListForm._instance.BringToFront(); CheckinListForm._instance.Visible = true; CheckinListForm._instance.load_CheckinList(); } else { CheckinListForm._instance.BringToFront(); CheckinListForm._instance.Visible = true; CheckinListForm._instance.load_CheckinList(); } }