C# FormShow & FormShowDialog & Prevent Duplication

[창공]

https://youtu.be/vaWk6yxQWX0

// FormShowDialog.cs

   public partial class FormShowDialog : Form

    {

        int OpenCount = 0;

        public FormShowDialog()

        {

            InitializeComponent();

        }

        private void button1_Click(object sender, EventArgs e)

        {

            if(DuoCheck("SettingForm")) return;

            //SettingForm dlg = new SettingForm(10, 20);

            SettingForm dlg = new SettingForm();

            dlg.exNum1 = 111;

            dlg.exNum2 = 222;

            // dlg.Show(this);

            //dlg.StartPosition = FormStartPosition.CenterScreen;

            //dlg.StartPosition = FormStartPosition.CenterParent;

            dlg.FormClosing += SettingCloseEvent;

            //dlg.TopMost = true;

            dlg.Text = "Setting Option";

            dlg.Show();

            OpenCount++;

            label1.Text = "Count : " + OpenCount;

            //dlg.ShowDialog();

            //this.Enabled = false;            

        }

        private void SettingCloseEvent(object sender, EventArgs e)

        {

            //this.Enabled = true;

            OpenCount--;

            label1.Text = "Count : " + OpenCount;

        }

        private bool DuoCheck(string name)

        {

            foreach(Form frm in Application.OpenForms)

            {

                if(frm.Name != name) continue;

                if(frm.WindowState == FormWindowState.Minimized)

                    frm.WindowState = FormWindowState.Normal;

                frm.Activate();

                return true;

            }

            return false;

        }

    }

// SettingForm.cs

    public partial class SettingForm : Form

    {

        public int exNum1, exNum2 ;

        public SettingForm()

        {

            InitializeComponent();

        }

        public SettingForm(int num1, int num2)

        {

            InitializeComponent();

            label1.Text = "" + num1;

            label2.Text = "" + num2;

            label3.Text = "" + (num1 + num2);

        }

        private void SettingForm_Load(object sender, EventArgs e)

        {

            label1.Text = "" + exNum1;

            label2.Text = "" + exNum2;

            label3.Text = "" + (exNum1 + exNum2);

        }

    }