private void btnAddCategory_Click(object sender, EventArgs e) { if (verifyStringToBeAdded(cbbCategory.Text, cbbCategory.Items.Cast<String>())) { DaoVideo daoVideo = new DaoVideo(); daoVideo.openConnection(this.GetType(), "sqlErrorHandler"); daoVideo.insertCategory(cbbCategory.Text, this.GetType(), "sqlErrorHandler"); daoVideo.closeConnection(); loadCategories(); updateLbCategory(); } cbbCategory.Focus(); }