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Figure 7-16. Adding a new typed DataSet to your project After you are on the DataSet designer, you can see the DataSet toolbox, shown in Figure 7-17.

You can create a new number var by parsing a string value. This is a static function and can be called without creating an instance of the object:

We declare an object identifier (Oid), which represents the GSS mechanism that we want to use to carry out the credential exchange. In our case, we want to use the Kerberos GSS protocol. The magic number here is defined in RFC 1964:

Figure 7-17. The DataSet toolbox As you can see, the toolbox has items such as DataTable and Relation that you can drag and drop on the DataSet designer. For our example, you need to drag and drop a DataTable on the DataSet designer and set its Name property to Employees. To add columns to the DataTable, you can right-click it and add the required number of columns. The name and data type of each column can then be set via the properties window. After designing the Employees DataTable, it should look like Figure 7-18.

Oid krb5Mechanism = new Oid("1.2.840.113554.1.2.2");

var n = Number.parseInvariant("23.2");

We retrieve an object representing the client principal, and an object representing the server principal, but we do not explicitly use principals here, allowing the underlying mechanism to determine the specifics. We do, however, specify that this is a username, rather than the name of a server or other principal type. The NT in NT_USER_NAME stands for Name Type rather than having any connection with the Windows NT operating system:

Figure 7-18. The Employees DataTable in the DataSet designer As you are designing the DataSet in the designer, Visual Studio creates a class that inherits from DataSet as the base class and adds certain properties and methods to it. You can see it in the Solution Explorer. Next, you need to design the main form of your application as shown in Figure 7-19.

Additionally, you can parse a localized string to get a number using the parseLocale function, like this:

GSSName clientName = manager.createName(credentialPrincipal, GSSName.NT_USER_NAME); GSSName serverName = manager.createName(contextPrincipal, GSSName.NT_USER_NAME);

Now we acquire an object that represents the credentials to initially be associated with the context object that we re creating. This will be the logged-in user associated with the subject:

var n = Number.parseLocale("23,2");

Figure 7-19. Application that consumes a typed DataSet The application behaves exactly the same as the one shown in Figure 7-6 earlier, but this time it uses our typed DataSet. Listing 7-19 shows the variable declarations at the form level.

// Acquire credentials for the user GSSCredential userCreds = manager.createCredential( clientName, GSSCredential.DEFAULT_LIFETIME, krb5Mechanism, usage);

String handling is always important, and the ASP.NET AJAX extensions provide a set of functions that make commonly used functions easier to implement.