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

Making UPC Code in C#.NET Part I

Part I
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UPC A Reader In C#
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Introducing Windows Workflow Foundation (WF)
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The State Activity
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Universal Product Code Version A Creator In Visual Studio .NET
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A type of workflow we ve not seen so far in this book is one based on the model of a deterministic state machine. Crusty old digital microelectronics engineers (and I sadly admit I am one) well understand the design and implementation of state machines. However, if you re not a crusty old digital microelectronics engineer, the concept might be new to you. 14 is entirely dedicated to working with state-based workflows, but I ll introduce the concept here. We ll build a quick little state-based workflow as well. People have dedicated their entire lives to the study of finite state machines. There is a language specific to finite state machines, custom mathematical notation, and a specific way they re diagrammed. I can t possibly hope to provide you with everything you might need to build statebased workflows, but I can provide enough information so that you can make sense of them as we build one or two. Tip There are many resources on the Internet that better and more deeply describe finite state machines. One that s worth looking into is en.wikipedia.org/wiki/Finite_state_machine. Breaking the term down, we have three words: finite, state, and machine. Finite, in this case, means we have a limited number of states we re willing to transition to. States are logical conditions our application transitions to as events occur. And machine implies automation. Let me illustrate by using an example. In engineering school, you might be asked to design any number of digital systems using a finite state machine. The two classic examples are the vending machine and the washing machine. Looking at the vending machine, think about the steps the machine has to take to provide you with its product (soda, candy, snacks whatever it s designed to dispense). As you insert coins, it counts the money until you ve provided at least enough to pay for your selection. As you make your selection, it checks inventory (if it didn t already indicate it was out of a specific choice). If there is inventory, it dispenses your selection. And if you provided too much money, it makes change and dispenses that as well. We can model the vending machine using a finite state machine. To diagram a finite state machine, we use circles as states and arrows as transitions between states. The transitions are triggered by events. There is a logical starting point and one or more logical stopping points. If we stop somewhere in between, our application is said to be in an indeterminate or invalid state. Our job is to prevent invalid states. We can t give our product away for free, and we shouldn t ask for more money than the product is worth, or worse, eat the user s money. Users have been known to get violently angry at vending machines that take their money but don t provide the goods.
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4
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Matrix 2D Barcode Drawer In Visual C#
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Introduction to Activities and Workflow Types
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2 Of 7 Code Creation In Visual C#
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So imagine a simplified vending machine. Let s lay out our states and events that lead to transitions between those states. States, as I mentioned, are represented by circles. Events, which move your machine from state to state, are represented by arrows. Both are named so that we know which states and which transitions are related. Tying all of this back to the vending machine, we certainly have a starting state, as we can see in Figure 4-2.
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Start
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Figure 4-2
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The symbol for the starting state of a finite-state machine
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This state represents the machine as it sits there, waiting for someone to come along and put in a coin. So let s say someone does come along and puts in a coin, but it s not enough money to purchase an item. We simulate that by creating a new state, WaitCoins, which we transition to through the CoinInserted event, as shown in Figure 4-3.
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