protected void btnDeleteCategory_Click(object sender, EventArgs e)
        {
            if (SelectedPortfolioCategory.IsInDatabase)
            {
                foreach (DbObjects.Business.PortfolioImage image in SelectedPortfolioCategory.Images)
                {
                    DeletePortfolioImage(image);
                }

                SelectedPortfolioCategory.Delete();
                SelectedPortfolioCategory = null;
            }

            Response.Redirect("Portfolio.aspx");
        }