code to generate barcode in vb.net Part I in C#.NET

Printer UPC Symbol in C#.NET Part I

Part I
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Decoding GTIN - 12 In C#.NET
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Introducing Windows Workflow Foundation (WF)
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6. In the Name field, type the name of your project or application. 7. In the Location field, type the file system location where you would like your project files stored. 8. If the Create Directory For Solution check box is not already selected, select it. 9. Click OK. Visual Studio 2005 will now create the basic project for you and bring up the workflow visual designer user interface.
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As with the sequential workflow application, Visual Studio is now ready for us to build a statemachine workflow. We re not quite ready to actually build a state-machine workflow at this point in the book. Why Because we need to trigger the events that cause the workflow to change state. To do that, we ll need to understand how workflow instances communicate with their host applications so that our host application can perform the trigger actions. We ll begin looking at host and workflow communication in 8, Calling External Methods, but it s in 10, Event Activities, that we learn what we need to know to drive state-machine workflows.
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4
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Introduction to Activities and Workflow Types
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4 Quick Reference
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To Select the appropriate workflow type Do This Model your system, and look closely at what is controlling the process. If the workflow is controlling the process, select a sequential workflow model. If external inputs are controlling the workflow, select a state-machine workflow. If complex behavior is to be modeled, a rules-based approach might be the best. Often a combination of workflow types will be necessary. Start Visual Studio 2005, and select the New and then Project menu items from the main File menu. From the resulting New Project dialog box, select the Workflow node from the Visual C# subtree shown in the Project Types pane. From the Templates pane, select either the Sequential Workflow Console Application or the Sequential Workflow Library type. Follow the steps for building a sequential workflow application until you choose the template. In the Templates pane, select either the State Machine Workflow Console Application or the State Machine Workflow Library type. Create a sequential workflow application, and then skip to 12 to learn how to apply the Policy or rule condition.
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Build a rules-based workflow application
5
Workflow Tracking
After completing this chapter, you will be able to:
Describe workflow-pluggable services Create an event tracking database and populate it with tables and scripts Activate the event-tracking service Create a custom tracking profile View your workflow's tracking information
So far we ve seen the basic objects that workflows are built from and controlled by. We build workflow tasks from activities, which when executing are managed by a WorkflowInstance object. Workflow instances are queued and controlled by the WorkflowRuntime. But Windows Workflow Foundation (WF) doesn t just provide us with objects it also provides us with services that work alongside our objects.
Pluggable Services
Workflow services are additional software functions that your workflows can, and will, use to complete their tasks. Some of the services are optional, like the tracking service we ll work with in this chapter. Other services are required for your workflow to execute at all. Workflow services are pluggable. A pluggable service is a service that can be selected a la carte to perform specific tasks. For example, there are services that manage threading, tracking, transactions, and so forth. You select the service that s right for your workflow. You can even create your own. So what do these services look like What do they do for us Table 5-1 lays out the available base services and gives you a better idea which services are available and what they do.
Part I
Introducing Windows Workflow Foundation (WF)
Most of these services we don t use directly. We ll typically use services derived from these base services.
Table 5-1 Service WorkflowPersistenceService WorkflowQueuingService WorkflowRuntimeService WorkflowSchedulerService WorkflowSubscriptionService WorkflowTransactionService TrackingService
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