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For those readers who have used MS Access, the IDENTITY keyword option is similar to AutoNumber. When adding a new row to a SQL Server table, you may wish to give this row a unique but easily identifiable ID number that can be used to link a row in one table with a row in another. Within the ApressFinancial database, there will be a table holding a list of transactions that needs to be linked to the customer table. Rather than trying to link on values that cannot guarantee a unique link (first name and surname, for example), a unique numeric ID value gives that possibility, providing it is used in conjunction with a unique index. If you have a customer with an ID of 100 in the Customers table and you have linked to the Transaction table via the ID, you could retrieve all the financial transactions for that customer where the foreign key is 100. However, this could mean that when you want to insert a new customer, you have to figure out which ID is next via some T-SQL code or using a table that just held next number identities. But fear not, this is where the IDENTITY option within a column definition is invaluable. By defining a column using the IDENTITY option, what you are informing SQL Server is that The column will have a value generated by SQL Server. There will be a start point (seed). An increment value is given, informing SQL Server by how much each new ID should increase. SQL server will manage the allocation of IDs.

When an exception occurs during an IClientChannelSink s processing, it has to call DispatchException() on the sink stack. The stack in this case generates a new ReturnMessage object, passing the original exception as a parameter to its constructor. This newly created return message travels through the chain of IMessageSinks, and the exception will be unwrapped by the AsyncResult sink.

launchctl load /System/Library/LaunchDaemons/com.apple.alf.agent.plist launchctl load /System/Library/LaunchAgents/com.apple.alf.useragent.plist

Figure 13-2. Create a new Windows application. If you face difficulty creating the Windows forms application project, then I d advise you to revisit 4 for detailed instructions. Let s move on and add the dataset and ReportViewer to the project. Let s start by selecting the project in Solution Explorer, rightclicking it, and selecting Add New Item DataSet. Please name the dataset dsBarcode.

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We all have a breakfast routine. Good or bad, it is something we tend to follow as we start our workday. And a majority of people start their day with a cup of coffee with friends.

All right, we have our dataset in place, with the data table and all necessary columns. We re all set to start working on designing the report layout. Add the report by selecting the project in Solution Explorer and right-clicking it; select Add New Item, and select Report from the Add New Item dialog box. Please name the report rptAgedAR.rdlc. Click the Add button to complete the process and make the new report part of the project. You ll also notice that a new toolbox called Data Sources is available with our dataset information inside.

In this book, we ll discuss four different kinds of client applications and develop various realworld examples with them. The client applications are based on the following technologies: Windows Forms Web Forms Web services Windows services

Looking at Listing 13-10, note that calling the Start method causes the processing agent to enter loop with n = 0. The agent then performs an asynchronous Receive request on the inbox for the MailboxProcessor; that is, the agent waits asynchronously until a message has been received. When the message msg is received, the program calls loop (n+msg). As additional messages are received, the internal counter (actually an argument) is incremented further. You post messages to the agent using counter.Post. The type of inbox.Receive is as follows: member Receive: unit -> Async<'Message> Using an asynchronous receive ensures that no real threads are blocked for the duration of the wait. This means the previous techniques scale to many thousands of concurrent agents.

Figure 5-17. The customized ListBox application As you can see from this example, you can easily change the format of data directly through the XAML.

NOTE: If you can scan port 389 (or port 636, if you are using SSL) from the server using localhost (127.0.0.1) then it typically stands to reason that if you cannot access port 389 on the server from a client via IP or DNS that you likely have a network problem that is preventing connectivity---even if the server requires authentication to enumerate the directory tree it should still listen over the LDAP port for said authentication. The second way to check that LDAP is available to your client systems is to telnet into port 389 of the host running the LDAP service. There are a number of services that can be tested in this manner, including most web servers and SMTP. For each service you would simply follow telnet by the name (or IP address) of the host you are testing and then the port, as follows:

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