generate code 128 barcode in c# Figure 1 Static task properties in C#

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Figure 1 Static task properties
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Expressions in SQL Server Integration Services
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Adding a property expression
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know how to do this already, consider it an exercise we won t walk through adding a variable step by step.) Second, we re going to add a property expression to the SqlStatementSource property of the Execute SQL Task. To do this, we ll follow the steps illustrated in figure 2.
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In the Properties window, select Execute SQL Task and then click on the ellipsis (...) button next to the Expressions property. This will cause the Property Expressions Editor dialog box to be displayed. In the Property Expressions Editor dialog box, select the SqlStatementSource property from the drop-down list in the Property column. Click on the ellipsis button in the Expression column. This will cause the Expression Builder dialog box to be displayed. (Please note that figure 2 shows only a subset of the Expression Builder dialog box to better fit on the printed page.) Enter the following expression in the Expression text box:
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"DELETE FROM [dbo].[Order Details] WHERE [OrderID] = " + (DT_WSTR, 50) @[User::OrderID]
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Click on the Evaluate Expression button to display the output of the expression in the Evaluated Value text box. (At this point it may be useful to copy and paste this value into a SQL Server Management Studio query window to ensure that the expression was constructed correctly.)
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Expressions in the control flow
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Click on the OK buttons to close the Expression Builder and Property Expressions Editor windows and save all changes. Execute the package to ensure that the functionality added through the expression behaves as required.
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Several important techniques are demonstrated in these steps: We started with a valid static value before we added the expression. Instead of starting off with a dynamic SQL statement, we started with a static statement which we tested to ensure that we had a known good starting point. We added a single piece of dynamic functionality at a time. Because our example was simple, we only added a single piece of dynamic functionality in total; but if we were adding both a dynamic WHERE clause and a dynamic table name, we would ve added each dynamic expression element to the static SQL statement individually. We tested the expression after each change. This basic technique is often overlooked, but it s a vital timesaver. The Expression Editor has limited debugging capabilities, and locating errors in a complex expression can be painfully difficult. By testing the expression after each change, the scope of debugging can be significantly reduced. With this example setting the stage, let s dive deeper into SSIS expressions by illustrating how they can be used to add dynamic functionality to our packages, and solve realworld problems.
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Expressions in the control flow
We ll continue by looking at expressions in the SSIS control flow. Although the example in the previous section is technically a control flow example (because we applied a property expression to a property of a task, and tasks are control flow components) there are more interesting examples and techniques we can explore. One of the most important and overlooked techniques is using expressions with precedence constraints to conditionally execute tasks. Consider the following requirements: If a specific table exists in the target database, execute a data flow task. If the table does not exist, execute an Execute SQL Task to create the table, and then execute the data flow task. If this problem needed to be solved using a traditional programming language, the developer would add an if statement and that would be that. But SSIS does not include an if statement, a branching task, or the like, so the solution, although simple, is not always obvious. An often-attempted approach to solve this problem is to add a property expression to the Disabled property of the Execute SQL Task. The rationale here is that if the Execute SQL Task is disabled then it won t execute, and only the data flow task will run. The main problem with this approach is that the Disabled property is designed to be used
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