winforms pdf 417 reader

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What do we actually mean when we talk about security In broad terms, we are talking about authentication, authorization, data integrity, and confidentiality. Authentication: This is the process of identifying a user based on credentials. In SOA, the user is not necessarily a person; it can be an application that is making a remote call from the intranet or Internet. This application must be able to identify itself by providing the required credentials. These credentials can be in the form of a username and password, also known as Username Token, or a digital certificate, such as an X.509 certificate or a Kerberos token. Authorization: This is the process of validating whether an already authenticated user has access to a particular resource. For example, a Web service can perform multiple operations and they might only be available to a limited group of users or roles. Together, authentication and authorization provide a security model that allows you to identify users and then give them selective access to resources. Integrity: This means that the message was not tampered during transit. A digitally signed message helps us ensure that the content of a message hasn t been modified before reaching its destination. Digital signatures work by generating a short string based on the content of the message. This short string or hash is most likely unique, and a single change made to the content of the message would generate a different hash value.

When using LINQ to SQL, your code won t typically interact with the underlying database connection object directly. To share an open database connection, you must really share the LINQ data context object. Csla.Data.ContextManager is intended to simplify this process by managing and automatically reusing a single data context object. The result is that all data access code that uses a data context object has the following structure: Using ctx = ContextManager(Of SqlConnection).GetManager("DatabaseName") ' ctx.Context is now an open data context object ' save your data here ' call any child objects to save themselves here End Using

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The SQLite extension is located in the sqlite3 package, which must be loaded using the package require directive. To connect to a database, use the sqlite3 command to create a database handle. This command takes two arguments: the first is the name of the database handle to be created, and the second is the path to the database file. The following example illustrates connecting to a database: #!/usr/bin/env tclsh package require sqlite3 puts "\nConnecting." sqlite3 db ./foods.db The usual database connection rules apply. Passing the value :memory: instead of a file name will create an in-memory database. Passing in the name of a new file will create a new database, and so on. The database handle returned corresponds to a connection to the specified database; however, it is not yet open it does not open the connection until you try to use it. The database handle is the sole object through which you work with the database. To disconnect, use the close method of the database handle. This will automatically roll back any pending transactions.

If the connection isn t already open, a connection object is created and opened. If the data context is already open, it is reused. When the last Using block completes, the data context object is automatically disposed of.

The extension executes queries using the eval method, which can process one or more queries at a time. eval can be used in several ways. The first way is to iterate through all records in a script following the SQL code. The script will be executed once for each row returned in the result set. The fields for each row are set as local variables within the script. Here s an example: puts "\nSelecting 5 records." db eval {select * from foods limit 5} { puts "$id $name" } There is another form in which you can assign the field values to an array. To do this, specify the array name after the SQL and before the script. Here s an example: puts "\nSelecting 5 records." db eval {select * from foods limit 5} values { puts "$values(id) $values(name)" }

Confidentiality: This is the process that guarantees that only authorized individuals have access to a message In order to protect a message, its contents must be encrypted An encrypted message would not be readable by intruders that do not possess the key to decrypt the message There are two types of encryption: symmetric and asymmetric Symmetric encryption: In this scenario the client and the service use the same key to encrypt and decrypt the message Asymmetric encryption: In this scenario one party encrypts the message using one key and the other party decrypts it using a different key This is also known as public key encryption These two keys are also known as the public/private key pair The public key is available to anyone who wants to communicate with the service, and the client uses this key to encrypt the messages.

Most of the time, the difference between a Null value and an empty value (such as an empty string or a zero) is not important in regard to applications, though it is in databases. When retrieving data from a database, an application needs to handle the occurrence of unexpected Null values with code such as the following: If dr.IsDBNull(idx) Then myValue = String.Empty Else myValue = dr.GetString(idx) End If Clearly, doing this over and over again throughout the application can get very tiresome. One solution is to fix the database so that it doesn t allow Null values when they provide no value, but this is often impractical for various reasons.

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