code to generate barcode in vb.net State-Based Workflows in C#.NET

Generator UPC Code in C#.NET State-Based Workflows

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State-Based Workflows
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7. Drop another State activity onto the visual workflow designer s surface, and name it WaitSelectionState.
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8. Drop the final State activity onto the visual workflow designer s surface, and change its name to EndState.
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9. Just as you reassigned the starting state, so too will you need to tell WF what the ending state will be. Click the visual workflow designer s surface outside any State activity to enable the workflow properties. Assign the CompletedStateName property to be EndState. Visual Studio then clears EndState s contents and changes the icon in the upperleft corner. As before, you can type EndState or select it from the drop-down list.
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Part III
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Workflow Processing
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10. With the state activities in place, let s now add details. Starting with StartState, drag an instance of the StateInitialization activity from the Toolbox and drop it into StartState.
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11. Double-click the activity you just inserted, stateInitialization1, to enter the sequential workflow editor.
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12. Drag a copy of the Code activity from the Toolbox, and drop it into the state initialization activity. Assign its ExecuteCode method to be ResetTotal. Visual Studio then adds the ResetTotal method for you and switches you to the code editor. Rather than add code at this point, return to the visual workflow designer.
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13. Next drag an instance of SetState onto the designer s surface, and drop it just below the Code activity you just inserted.
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State-Based Workflows
14. Assign the SetState s TargetStateName property to be WaitCoinsState.
15. To return to the visual workflow designer s state editor view, click the Workflow1 hyperlink-style button in the upper-left corner.
The state editor should now indicate that StartState transitions to WaitCoinsState.
Part III
Workflow Processing
16. StartState is now complete. Next we ll turn to WaitCoinsState. To begin, drag a copy of the EventDriven activity onto the designer s surface and drop it into WaitCoinsState. Name it CoinInserted by changing its Name property in the Visual Studio Properties pane (you must press Enter for the change to take place).
17. Double-click the CoinInserted EventDriven activity to enable the sequential workflow editor.
18. Now drag an instance of the CoinInserted custom activity from the Toolbox and drop it onto the EventDriven activity s surface. Note that if you haven t yet compiled the entire solution, the CoinInserted event doesn t appear in the Toolbox. You might have to remove the EventDriven activity to successfully compile if you skipped step 2.
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State-Based Workflows
19. With the ExternalEventHandler coinInserted1 activity selected in the visual workflow designer, click the CoinValue property in the Properties pane to activate the browse ( ) button, and then click the browse button. This brings up the Bind CoinValue To An Activity s Property dialog box. Click the Bind To A New Member tab, and type LastCoinDropped in the New Member Name field. The Create Property option should be selected, but if it isn t, select it so that you create a new dependency property. Click OK.
20. Now we need to make a decision did the user just drop enough money to enable soda selection To do this, drag an instance of the IfElse activity onto the visual workflow designer s surface and drop it into the CoinInserted EventDriven activity, following the coinInserted1 event handler.
Part III
Workflow Processing
21. Select the left branch of ifElseActivity1 to display its properties in the Properties pane. For its Condition property, select Code Condition. Expand the Condition node and in the child Condition property, type TestTotal. When Visual Studio adds the new method and switches you to the code editor, return to the visual workflow designer.
22. TestTotal will eventually check the total amount of money inserted into the soda machine. (We ll finish the workflow in the visual workflow designer before adding code because there are properties we need that have not yet been created.) If enough money has been inserted, we need to transition to the WaitSelectionState. Therefore, drag a copy of SetState into the left IfElse activity branch, ifElseBranchActivity1, and drop it. Assign its TargetStateName to be WaitSelectionState.
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