public void RefreshDG()
        {
            Admin Auto = new Admin();
            tbItemNumber.Text = Auto.InventoryAutoGenerateID();

            Admin Show = new Admin();
            dgAllItem.DataSource = Show.InventoryDGV();
            dgAllItem.DataMember = "Inventory";

            dgSearchItem.DataSource = Show.InventoryDGV();
            dgSearchItem.DataMember = "Inventory";

            dgEditItem.DataSource = Show.InventoryDGV();
            dgEditItem.DataMember = "Inventory";

            tbEditAddStock.Enabled = false;
        }