private void button1_Click(object sender, EventArgs e)
        {
            if (tbxArticle.Text == "")
            {
                MessageBox.Show("The Article is required!", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
                return;
            }

            if (!this.validateAlpha(tbxArticle.Text))
            {
                MessageBox.Show("The Article field is invalid!", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
                return;
            }

            if (cbxTypeArticle.SelectedItem == null)
            {
                MessageBox.Show("The Article type is required!", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
                return;
            }

            TypeArticle t = new TypeArticle();

            t.loadByUnique(cbxTypeArticle.SelectedItem.ToString());

            Article type = new Article();

            type.id          = this.mainID;
            type.typeArticle = t.id;
            type.article     = tbxArticle.Text.Trim();
            type.save();
            if (this.mainID == null)
            {
                MessageBox.Show("Type Article successfully inserted!", "Success", MessageBoxButtons.OK, MessageBoxIcon.Information);
            }
            else
            {
                MessageBox.Show("Type Article successfully updated!", "Success", MessageBoxButtons.OK, MessageBoxIcon.Information);
            }
            this.Close();
        }