private void metroButton5_Click(object sender, EventArgs e)
        {
            if (metroGrid4.Rows.Count != 0)
            {
                AttributeValueModel.id        = metroGrid4.Rows[metroGrid4.SelectedRows[0].Index].Cells[0].Value.ToString();
                AttributeValueModel.name      = metroGrid4.Rows[metroGrid4.SelectedRows[0].Index].Cells[1].Value.ToString();
                AttributeValueModel.attribute = attributeValueGrid.Rows[attributeValueGrid.SelectedRows[0].Index].Cells[1].Value.ToString();

                add_attributeValue update = new add_attributeValue(true);
                update.ShowDialog();
            }
            else
            {
                MetroMessageBox.Show(this, "You need to add a value first", "Update Failed", MessageBoxButtons.OK, MessageBoxIcon.Warning);
            }
        }
        private void metroButton6_Click(object sender, EventArgs e)
        {
            add_attributeValue add = new add_attributeValue();

            add.ShowDialog();
        }