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Note A data adapter is agnostic by nature. You can plug in different connection objects and command objects on the fly and fetch data from a diverse variety of databases. For example, a single DataSet could contain table data obtained from SQL server, Oracle, and MySQL database providers.

NTLM authentication is integrated into the Windows operating system since it has built-in network support NTLM authenticates clients through a challenge/response mechanism that is based on a three-way handshake between the client and the server Everything you will learn about in this section takes place on the operating system automatically Of course, this works only if the client and the server are running Windows Basically, the client starts the communication by sending a message to the server, which indicates that the client wants to talk to the server The server generates a 64-bit random value called the nonce The server responds to the client s request by returning this nonce This response is called the challenge Now the client operating system asks the user for a user name and password Immediately after the user has entered this information, the system hashes the password.

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The next step is to add new functionality to the data access library assembly (AutoLotDAL.dll) you created in 21. Begin by creating a simple example that fills a DataSet with a single table using an ADO.NET data adapter object. Create a new Console Application named FillDataSetUsingSqlDataAdapter and import the System.Data and System.Data.SqlClient namespaces into your initial C# code file. Now update your

This password hash called the master key will then be used for encrypting the nonce Together with the user name, the client transmits the encrypted nonce in his response to the server (completing the challenge/response mechanism) The server now needs to validate the returned nonce Depending on whether the user is a local user or a domain user, this validation takes place locally or remotely on the domain controller In both cases, the user s master key, which is the hashed version of the password, is retrieved from the security account database This master key then encrypts the clear-text nonce again on the server (of course, the server has cached the clear-text nonce before it transmits the data to the client).

Main() method as follows (you might need to change the connection string, based on how you created the AutoLot database in the previous chapter): static void Main(string[] args) { Console.WriteLine("***** Fun with Data Adapters *****\n"); // Hard-coded connection string. string cnStr = "Integrated Security = SSPI;Initial Catalog=AutoLot;" + @"Data Source=(local)\SQLEXPRESS"; // Caller creates the DataSet object. DataSet ds = new DataSet("AutoLot"); // Inform adapter of the Select command text and connection string. SqlDataAdapter dAdapt = new SqlDataAdapter("Select * From Inventory", cnStr); // Fill our DataSet with a new table, named Inventory. dAdapt.Fill(ds, "Inventory"); // Display contents of DataSet. PrintDataSet(ds); Console.ReadLine(); } Notice that you construct the data adapter by specifying a string literal that will map to the SQL Select statement. You will use this value to build a command object internally, which you can obtain later using the SelectCommand property. Next, notice that it is the job of the caller to create an instance of the DataSet type, which is passed into the Fill() method. Optionally, you can pass the Fill() method as a second argument a string name that you use to set the TableName property of the new DataTable (if you do not specify a table name, the data adapter will simply name the table, Table). In most cases, the name you assign a DataTable will be identical to the name of the physical table in the relational database; however, this is not required.

private UserService userService; private final String EMAIL_ADDED_USER = "dustin.robert@apress.com"; private final String USERNAME = "dustin34";

Note The Fill() method returns an integer that represents the number of rows returned by the SQL query.

If the re-created encrypted version of the nonce matches the encrypted version returned from the client, the user is authenticated successfully, and a logon session is created on the server for the user Figure 22-3 shows the process flow As you can see, the password is never transmitted across the wire Even the hashed version of the password is never transmitted This makes NTLM really secure But there is even a more secure protocol with additional possibilities, as you will see in the next section..

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