private void RandevularımToolStripMenuItem_Click(object sender, EventArgs e)
{
var frmAppointment = new FrmMyAppointments();
frmAppointment.MdiParent = this;
frmAppointment.Show();
}
private FrmMyAppointments gridForm; // Burada Tanımladık
public FrmAppointment(FrmMyAppointments gridForm)
{
this.gridForm = gridForm;
InitializeComponent();
}