// Package Created When clicked Save Button
        private void BtnSave_Click(object sender, EventArgs e)
        {
            string PackName     = txtPackName.Text.Trim();
            string PackQuantity = txtPackQuantity.Text.Trim();
            string PackPrice    = txtPackPrice.Text.Trim();

            if (!string.IsNullOrEmpty(PackName) ||
                !string.IsNullOrEmpty(PackQuantity) ||
                !string.IsNullOrEmpty(PackPrice))
            {
                if (ValidatePackage())
                {
                    Package package = new Package();
                    package.Name          = uniMetods.FirstCharToUpper(PackName);
                    package.EntryQuantity = byte.Parse(uniMetods.FirstCharToUpper(PackQuantity));
                    package.Price         = double.Parse(uniMetods.FirstCharToUpper(PackPrice));
                    package.Status        = true;
                    _context.Packages.Add(package);
                    _context.SaveChanges();
                    FillPackageList();
                }
            }
            else
            {
                MessageBox.Show("Please, Fill all fields");
            }
        }
 // Customer Created When clicked Save Button
 private void BtnSave_Click(object sender, EventArgs e)
 {
     Fname = txtFname.Text.Trim();
     Lname = txtLname.Text.Trim();
     Bdate = txtBirthdate.Text.Trim();
     Phone = txtPhone.Text.Trim();
     Blnc  = txtBalance.Text.Trim();
     if (!string.IsNullOrEmpty(Fname) || !string.IsNullOrEmpty(Lname) || !string.IsNullOrEmpty(Bdate) || !string.IsNullOrEmpty(Phone) || !string.IsNullOrEmpty(Blnc))
     {
         if (ValidatePayment())
         {
             Customer customer = new Customer();
             customer.Firstname = uniMetods.FirstCharToUpper(Fname);
             customer.Lastname  = uniMetods.FirstCharToUpper(Lname);
             customer.Birthdate = DateTime.Parse(Bdate);
             customer.Phone     = uniMetods.FirstCharToUpper(Phone);
             customer.Balance   = double.Parse(Blnc);
             customer.Status    = true;
             _context.Customers.Add(customer);
             _context.SaveChanges();
             FillCustomerList();
         }
     }
     else
     {
         MessageBox.Show("Please, Fill all fields");
     }
 }
 // Product Created When clicked Save Button
 private void BtnSave_Click(object sender, EventArgs e)
 {
     if (!string.IsNullOrEmpty(txtName.Text.Trim()) || !string.IsNullOrEmpty(txtPrice.Text.Trim()))
     {
         if (ValidateProduct())
         {
             MenuItem menuItem = new MenuItem();
             string   TxtName  = txtName.Text.Trim();
             string   TxtPrice = txtPrice.Text.Trim();
             menuItem.Name = uniMetods.FirstCharToUpper(TxtName);
             double Price = double.Parse(TxtPrice);
             menuItem.Price  = Price;
             menuItem.Status = true;
             _context.MenuItems.Add(menuItem);
             _context.SaveChanges();
             FillProductList();
         }
     }
     else
     {
         MessageBox.Show("Please, Fill all fields");
     }
 }