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// deletes a product from the product catalog public static bool DeleteProduct(string productId) { // get a configured DbCommand object DbCommand comm = GenericDataAccess.CreateCommand(); // set the stored procedure name comm.CommandText = "CatalogDeleteProduct"; // create a new parameter DbParameter param = comm.CreateParameter(); param.ParameterName = "@ProductID"; param.Value = productId; param.DbType = DbType.Int32; comm.Parameters.Add(param); // result will represent the number of changed rows int result = -1; try { // execute the stored procedure result = GenericDataAccess.ExecuteNonQuery(comm); } catch { // any errors are logged in GenericDataAccess, we ignore them here } // result will be 1 in case of success return (result != -1); } 9. We ll now implement the user interface component AdminProductDetails.aspx. Create a new Web Form named AdminProductDetails.aspx in the root folder of your project (make sure the Place code in separate file option is checked), based on the Admin.master template. 10. In the first placeholder, type the name of the page: <asp:Content ID="Content1" ContentPlaceHolderID="titlePlaceHolder" runat="Server"> <span class="AdminTitle"> BalloonShop Admin <br /> Back to <asp:HyperLink ID="catLink" runat="server" /> </span> </asp:Content> 11. In the second placeholder, add controls to the form, as shown in Figure 12-8. Here you ll meet the FileUpload control for the first time.

To sort columns of data by rows, follow these steps: 1. Click a cell in the range you want to sort. 2. Click Data Sort.

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The class ConfigurationManager is a static class that provides the entry point to reading items from a configuration file. In this example, a couple assumptions have been made. The first assumption is that you want to read the configuration settings from the application that is currently executing. The second assumption is that you want to read the configuration items stored within the XML node <appSettings>. Based on those two assumptions, the settings are stored in a static property named AppSettings, which returns an instance of type NameValueCollection. (The way that AppSettings is referenced makes it appear as if AppSettings were an indexer, which it is not.) When retrieving the buffer of comma-separated identifiers using ConfigurationManager, you need to parse the buffer and then make sense of the information, as described in the next section.

Figure 12-8. The product details admin page The following is the associated source code: <asp:Content ID="Content2" ContentPlaceHolderID="adminPlaceHolder" runat="Server"> <asp:Label CssClass="AdminTitle" ID="productNameLabel" runat="server" /> <p> <asp:Label ID="statusLabel" CssClass="AdminError" runat="server" /> </p> <p> Product belongs to these categories: <asp:Label ID="categoriesLabel" runat="server" /> </p> <p> Remove product from this category: <asp:DropDownList ID="categoriesListRemove" runat="server" /> <asp:Button ID="removeButton" runat="server" Text="Remove" OnClick="removeButton_Click" /> <asp:Button ID="deleteButton" runat="server" Text="DELETE FROM CATALOG" OnClick="deleteButton_Click" /> </p> <p> Assign product to this category: <asp:DropDownList ID="categoriesListAssign" runat="server" /> <asp:Button ID="assignButton" runat="server" Text="Assign" OnClick="assignButton_Click" /> <p>

In .NET terms, to use the configuration file with a dynamically loaded application, you need to load the assembly, and from the assembly, instantiate the type. You can reference assemblies locally and also reference them from the GAC.

Move product to this category: <asp:DropDownList ID="categoriesListMove" runat="server" /> <asp:Button ID="moveButton" runat="server" Text="Move" OnClick="moveButton_Click" /> </p> <p> Image1 file name: <asp:Label ID="Image1Label" runat="server" /> <asp:FileUpload ID="image1FileUpload" runat="server" /> <asp:Button ID="upload1Button" runat="server" Text="Upload" /><br /> <asp:Image ID="image1" runat="server" /> </p> <p> Image2 file name: <asp:Label ID="Image2Label" runat="server" /> <asp:FileUpload ID="image2FileUpload" runat="server" /> <asp:Button ID="upload2Button" runat="server" Text="Upload" /><br /> <asp:Image ID="image2" runat="server" /> </p> </asp:Content> 12. Open the code-behind file and complete the AdminProductDetails class, as shown in the code snippet: using System.Data; public partial class AdminProductDetails : System.Web.UI.Page { // store product, category, and department IDs as class members private string currentProductId, currentCategoryId, currentDepartmentId; protected void Page_Load(object sender, EventArgs e) { // Get DepartmentID, CategoryID, and ProductID from the query string // and save their values currentDepartmentId = Request.QueryString["DepartmentID"]; currentCategoryId = Request.QueryString["CategoryID"]; currentProductId = Request.QueryString["ProductID"]; // Fill the controls with data only on the initial page load if (!IsPostBack) { // Fill controls with data PopulateControls(); } }

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