how to fix code 39 error network adapter

how to fix code 39 error network adapter

how to fix code 39 error network adapter

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ClearDataText.Text = SymmetricEncryptionUtility.DecryptData(data, KeyFileName) End Sub The previous page uses the DES algorithm because you set the AlgorithmName of your utility class appropriately. Within the Click event of the GenerateKeyCommand button, it calls the GenerateKey() method. Depending on the check box of the page, it encrypts the key itself through the DPAPI or not. After the data has been encrypted through your utility class within the Click event of the EncryptCommand button, it converts the encrypted bytes to a Base64 string and then writes it to the EncryptedDataText text box. Therefore, if you want to decrypt information again, you have to create a byte array based on this Base64 string representation and then call the method for decryption. You can see the result in Figure 25-6.

Now that you ve learned how to use profiles, it s worth considering an end-to-end example that uses the GridView and the profiles feature to build a basic shopping cart. Shopping carts are a hallmark of e-commerce websites. They allow users to select a batch of items for an upcoming purchase. Using profiles, you can store shopping cart information in a user s profile so that it s stored permanently for repeat visits. When the user makes the purchase, you can remove the profile information and use a database component to commit the corresponding order records. In the following sections, you ll go through the steps needed to build a complete shopping cart framework that revolves around a single test page (see Figure 24-6). This test pages uses two databound controls one to show the product catalog and one to show the shopping cart items. To add items from the catalog, the user must click a link in the product catalog.

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To try this example, you need to create, at a bare minimum, a database with a Users table and the two stored procedures. The following example demonstrates an example with a Users table that provides address information (see Figure 24-7)

You can also use the following model if you want to store shopping cart information in session state. You still set up the grid controls in the same way and use the same shopping cart classes. The only difference is that the shopping cart is stored temporarily in the Session collection instead of in the database through the Page.Profile property.

Using asymmetric algorithms is similar to using symmetric algorithms. You will see just a handful of differences. The major difference has to do with key management. Symmetric algorithms just have one key, and asymmetric algorithms have two keys: one for encrypting data (public key) and one for decrypting data (private key). While the public key can be available to everyone who wants to encrypt data, the private key should be available only to those decrypting information. In this section, you will create a utility class similar to the previous one. Because the .NET Framework ships with only one asymmetric algorithm for real data encryption (RSA; remember, DSA is used for digital signatures only), you don t need to include a way to select the algorithm (for a while). Public Class AsymmetricEncryptionUtility Private Sub New()

Figure 24-7. A custom Users table A straightforward procedure named Users_GetByUserName queries the profile information from the table: CREATE PROCEDURE Users_GetByUserName @UserName varchar(50) AS SELECT * FROM Users WHERE UserName = @UserName GO The Users_Update stored procedure is a little more interesting. It begins by checking for the existence of the specified user. If the user doesn t exist, a record is created with the profile information. If the user does exist, that record is updated. This design meshes with the behavior of the SqlProfileProvider.

In theory, you could use the DataRow and DataTable objects to represent a shopping cart. However, because the shopping cart information doesn t directly correspond to a table in the database, the process would be awkward and counterintuitive. A better approach is to design your own classes to represent the shopping cart and its items. The first ingredient you need is a class to represent individual shopping cart items. This class needs to track the product information, along with the number of units the user wants to order. Here s a ShoppingCartItem class that fills this role: [Serializable()] public class ShoppingCartItem { private int productID; public int ProductID {

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