winforms ean 13

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Figure 4-12. A valid state for the New York Node instance Looking at the node structure in Figure 4-12, you can see that New York points to Montreal and back again. The infinite connection does not mean that you are using infinite resources. Instead, it means one reference is being set to another, as illustrated in Figure 4-13.

1. Start SQL Server Management Studio, load the BalloonShop database, and open a new SQL query page. Then execute this code, which adds the Review table in your BalloonShop database: -- Create review table CREATE TABLE Review ( ReviewID INT NOT NULL PRIMARY KEY IDENTITY(1,1), CustomerID UNIQUEIDENTIFIER NOT NULL, ProductID INT NOT NULL, Review NVARCHAR(MAX) NOT NULL, DateCreated DATETIME NOT NULL) 2. Execute the following code, which creates the CatalogGetProductReviews stored procedure in the BalloonShop database. The CatalogGetProductReviews stored procedure retrieves the reviews for the product identified by the inProductId parameter. We also need the name of the reviewer, so we made an INNER JOIN with the customer table. -- Create CatalogGetProductReviews stored procedure CREATE PROCEDURE CatalogGetProductReviews(@ProductID INT) AS SELECT u.UserName as CustomerName, r.Review as ProductReview, r.DateCreated as ReviewDate FROM Review r INNER JOIN aspnet_Users u ON u.UserID = r.CustomerID WHERE r.ProductID = @ProductID ORDER BY r.DateCreated DESC 3. Execute the following code, which adds the CatalogAddProductReview stored procedure in the BalloonShop database. When a registered visitor adds a product review, the CatalogAddProductReview stored procedure is called. -- Create CatalogAddProductReview stored procedure CREATE PROCEDURE CatalogAddProductReview (@CustomerId UNIQUEIDENTIFIER, @ProductId INT, @Review NVARCHAR(MAX)) AS INSERT INTO Review (CustomerID, ProductID, Review, DateCreated) VALUES (@CustomerId, @ProductId, @Review, GETDATE())

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The apparent infinite resources are the cross-reference recursive assignment of two pieces of heap memory. It is fine to do this, and this ability is one of the reasons why people prefer using reference types to value types. Often, when people use value types, they will assume certain variables or data members are being assigned when, in fact, they are not assigned.

4. Add the corresponding business tier methods to the Catalog class in App_Code/CatalogAccess.cs: // Gets the reviews for a specific product public static DataTable GetProductReviews(string productId) { // get a configured DbCommand object DbCommand comm = GenericDataAccess.CreateCommand(); // set the stored procedure name comm.CommandText = "CatalogGetProductReviews"; // create a new parameter DbParameter param = comm.CreateParameter(); param.ParameterName = "@ProductID"; param.Value = productId; param.DbType = DbType.Int32; comm.Parameters.Add(param); // execute the stored procedure return GenericDataAccess.ExecuteSelectCommand(comm); } // Add a new shopping cart item public static bool AddReview(string customerId, string productId, string review) { // get a configured DbCommand object DbCommand comm = GenericDataAccess.CreateCommand(); // set the stored procedure name comm.CommandText = "CatalogAddProductReview "; // create a new parameter DbParameter param = comm.CreateParameter(); param.ParameterName = "@CustomerID"; param.Value = customerId; param.DbType = DbType.String; comm.Parameters.Add(param); // create a new parameter param = comm.CreateParameter(); param.ParameterName = "@ProductID"; param.Value = productId; param.DbType = DbType.Int32; comm.Parameters.Add(param); // create a new parameter param = comm.CreateParameter(); param.ParameterName = "@Review"; param.Value = review; param.DbType = DbType.String; comm.Parameters.Add(param); // returns true in case of success or false in case of an error try {

// execute the stored procedure and return true if it executes // successfully, or false otherwise return (GenericDataAccess.ExecuteNonQuery(comm) != -1); } catch { // prevent the exception from propagating, but return false to // signal the error return false; } } 5. The UI consists of the ProductReviews.ascx Web User Control that will be placed on the product details page. Start by creating ProductReviews.ascx in the UserControls folder (using a codebehind file) and editing it like this: <%@ Control Language="C#" AutoEventWireup="true" CodeFile="ProductReviews.ascx.cs" Inherits="UserControls_ProductReviews"%> <p class="ReviewHead">Customer Reviews</p> <asp:DataList ID="list" runat="server" ShowFooter="true" CssClass="ReviewTable"> <ItemStyle CssClass="ReviewTable" /> <ItemTemplate> <p> Review by <strong> <%# Eval("CustomerName") %></strong> on <%# String.Format("{0:D}", Eval("ReviewDate")) %>: <br /> <i> <%# Eval("ProductReview") %></i> </p> </ItemTemplate> <FooterTemplate> </FooterTemplate> </asp:DataList> <asp:Panel ID="addReviewPanel" runat="server"> <p> Write your own review!</p> <p> <asp:TextBox runat="server" ID="reviewTextBox" Rows="3" Columns="88" TextMode="MultiLine" /> </p> <asp:LinkButton ID="addReviewButton" runat="server" OnClick="addReviewButton_Click">Add Review</asp:LinkButton> </asp:Panel>

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