public void LoadModelByCategoryAndBrand()
        {
            List <Model> models = sql.getModelByCategoryAndBrandAll(comboBox_Categories.Text, comboBox_Brands.Text);

            comboBox_Model.DataSource    = models;
            comboBox_Model.DisplayMember = "nameModel";
            comboBox_Model.ValueMember   = "nameModel";
            if (device != null)
            {
                comboBox_Model.Text = device.Model;
            }
            models = null;
        }