Windows 窗体无法显示 CenterScreen

Question

I used this code for the secondary form to act / be like mdi, this is windows form C#

        frmFontLoad fontLoad = new frmFontLoad();
        
        fontLoad.TopLevel = false;
        Controls.Add(fontLoad);
        fontLoad.Show();
        fontLoad.BringToFront();

but the result then the form was loaded is like this refer to screenshot:

Form

Code on Form Load:

  private void frmLabelPNInput_Load(object sender, EventArgs e)
        {
            this.StartPosition = FormStartPosition.CenterScreen;

            Printer_SerialPort = new SerialPort(ConfigurationManager.AppSettings["Printer_com_port"]);

            btnOk.Enabled = false;
        }

how can i make this secondary form to be displayed at the center?

Answer 1

        frmProgress progress = new frmProgress();
        progress.Left = (this.ClientSize.Width - progress.Width) / 2;
        progress.Top = (this.ClientSize.Height - progress.Height) / 2;

This solved my problem, thanks