private void button1_Click(object sender, EventArgs e)
        {
            string itemID   = textBox1.Text;
            string itemName = textBox2.Text;
            double price;
            double Weight;

            Double.TryParse(textBox3.Text, out price);
            Double.TryParse(textBox4.Text, out Weight);


            HardwareItem newItem = new HardwareItem(itemID, itemName, price, Weight);

            itemsBaza db = new itemsBaza();

            db.SaveHardwareItem(newItem);

            MessageBox.Show("Izdelek dodan");

            textBox1.Text = "";
            textBox2.Text = "";
            textBox3.Text = "";
            textBox4.Text = "";
        }