bytescout barcode reader sdk for .net Part V in visual C#.net

Printer PDF417 in visual C#.net Part V

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To view additional details about the dialog process, you or the user running the dialog process can access the summary of the dialog session. This information is made available by opening a dialog session record or while progressing through the dialog process by selecting the Summary button, as shown in Figure 15-24. Important As you can see, the responses to each prompt are available for review in the

The COMMENT command allows you to add clarifying (semantic) explanations about tables and table columns to the data dictionary. Figure 7-20 shows the syntax diagram for this command.

USE InsideTSQL2008; GO SELECT n FROM dbo.Nums ORDER BY REVERSE(n);

When you re working with indexes, keep in mind that although you can decide about index existence with the CREATE INDEX and DROP INDEX commands, the Oracle optimizer decides about index usage. The optimizer chooses the execution plan for each SQL statement. The next section explains how you can see if the optimizer is using your indexes.

To create and compare hash values, you use a hash provider. As you saw earlier, the Cryptography block includes several hash providers. The examples we provide use two of these: the SHA512 hash algorithm provider and the MD5Cng hash algorithm provider. The examples demonstrate how to use these providers to create a hash for both a text string and an object (in our example this is a simple class named Product), and how to compare the generated hashes with the original and other text strings and object instances. The Cryptography Manager exposes two methods for working with hash providers: The CreateHash method takes as parameters the name of a hash provider configured in the Cryptography block for the application, and the item for which it will create the hash value. There are two overloads of this method. One accepts a string and returns the hash as a string. The second overload accepts the data to encrypt as a byte array, and returns a byte array containing the hash value. The CompareHash method takes as parameters the name of a hash provider configured in the Cryptography block for the application, the un-hashed item to compare the hash with, and the hash value to compare to the un-hashed item. There are two overloads of this method. One accepts the un-hashed item and the hash as strings. The second overload accepts the un-hashed item and the hash as byte arrays. Creating and Comparing Hash Values for Text Strings The example Create and Compare Hash Values for Text Strings uses the SHA512 hash algorithm provider to create a hash of three text strings. It then compares these hashes with the original and other values to demonstrate how even a minor difference between the original strings creates different hash values. The code shown below creates three text strings that will be hashed. Notice that the second and third vary only in the letter case of two words. Then the code uses the CreateHash method of the Cryptography Manager to create the hashes of these three strings. In each case, the code passes to the CreateHash method the name of the SHA512 hash algorithm provider defined in the configuration of the application, and the text string. Next, the code performs three comparisons of the hash values using the CompareHash method of the Cryptography Manager. It compares the hash of the first string with first string itself, to prove that they are equivalent. Then it compares the hash of the first string with the second string, to provide that they are not equivalent. Finally,