private void DashboardForm_Activated(object sender, EventArgs e)
{
subscriberBLL = new SubscriberBLL();
materialBLL = new MaterialBLL();
borrbll = new BorrowBLL();
comboMembers.SelectedIndex = 0;
txtTotalMembers.Text = subscriberBLL.GetTotalCountSubscribers().ToString();
txtTotalMaterials.Text = materialBLL.GetTotalCountMaterials().ToString();
txtTotalBorrowings.Text = borrbll.GetTotalCountBorrowings().ToString();
}