private void AddProductButton_Click(object sender, EventArgs e)
        {
            AddProductForm formAddP = new AddProductForm(this);

            formAddP.GetContext = 1;
            formAddP.Show();
            fillDGP(docID);
        }
        private void UpdateAddProductButton_Click(object sender, EventArgs e)
        {
            AddProductForm formAddP = new AddProductForm(this);

            formAddP.GetContext     = 2;
            formAddP.GetUpdateDocId = DocId;
            formAddP.Show();
        }