create pdf417 barcode in c# Assigning and Unassigning Resources in C#

Development PDF 417 in C# Assigning and Unassigning Resources

Working with the <credentials> Element
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This is a new page-level event. After PreRenderComplete is fired, state information for all controls is committed to view state. This event fires after that work is complete. (See 4 for an example of how to make use of this event during control state persistence.)
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Public Shared Function GetSwitchableObject(ByVal id As Integer) _ As SwitchableObject Return DataPortal.Fetch(Of SwitchableObject)(New _ SingleCriteria(Of SwitchableObject, Integer)(id)) End Function Public Shared Sub DeleteSwitchableObject(ByVal id As Integer) DataPortal.Delete(New SingleCriteria(Of SwitchableObject, Integer)(id)) End Sub #End Region Notice that this region is no different from the factory region in an editable root. Then there s a whole other set of factory methods to support the object s use as a child. #Region "Child Factory Methods" Friend Shared Function NewSwitchableChild() As SwitchableObject Return DataPortal.CreateChild(Of SwitchableObject)() End Function Friend Shared Function GetSwitchableChild(ByVal childData As Object) _ As SwitchableObject Return DataPortal.FetchChild(Of SwitchableObject)(childData) End Function Private Sub New() ' Require use of factory methods End Sub #End Region This set of factory methods is the same as what you d see in an editable child. The key here is that the UI can call the Public factory methods directly to interact with the object as a root, while only a parent object can call the Friend factory methods to use the object as a child.
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Whenever you use a Generic type, a specific version of the Generic type is dynamically created. If the Generic type were used with three different types, then three different versions would be dynamically created. This results in a larger application requirement when the .NET application is executed. The size change can either be negligible or significant. It only depends on the number of different types, and how often a Generic type is embedded within another Generic type. For example, in the mid-1990s when templates were introduced in C++ (a feature similar in theory to C# Generics), I had to compile a set of Generic types that expanded 65 levels. The resulting code size meant every time the type was instantiated, two megabytes of memory space was required. It s doubtful that C# will suffer from the same problems as C++ templates. It does mean that some developers will overuse Generics. When illustrating Generics, many developers will show how much better it is to write a list or stack class. They demonstrate how type-safe the list or stack is, thus making the classes stable and robust. These demonstrations aren t without merit, even though they offer a false sense of security. As explained earlier, there are two types of errors: logical and syntax. Syntax errors aren t a problem, and generally speaking, doing an improper cast is also not a major problem. It s easy to find and fix this type of problem. More problematic are logical errors, a kind of error that Generics don t address. In fact, in some cases, Generics amplify the problem, because the source code that uses Generics extensively is abstract and requires some thinking to figure out what s being defined. Putting it simply, imagine developing an architecture that can be abstracted. When implementing the abstraction, another abstraction is created, and when creating that abstraction, yet another abstraction is created. To make all these abstractions work together, the developer has to assign the correct classes with one another. The problem is that what seems obvious to one person isn t obvious to another person. Hence, the advantage of the abstraction is lost. In contrast, when writing a class that implements an interface and references another class, you know what the intention is. For example, what happens when a generic type uses a generic type, which in turn uses a generic type Unless the developer has an intimate understanding of Generics, conceptual problems will arise. My point is neither to scare nor to be a naysayer of Generics. Rather, I say to use Generics, as they solve many problems elegantly, but realize that Generics are a powerful mechanism that should be treated with respect and used in proper doses.
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Dealing with Common Behaviors and Information
12. While still inside the Vehicle class, change ShowModeOfTransporation to make it abstract
When so much focus is placed on distributed systems, it s easy to forget the value of a single-tier solution. Point of sale, sales force automation, and many other types of application often run in stand-alone environments. However, the benefits of the logical n-layer architecture are still desirable in terms of maintainability and code reuse. It probably goes without saying that everything can be installed on a single client workstation. An optimal performance smart client is usually implemented using Windows Forms for the presentation and UI, with the business logic and data access code running in the same process and talking to an Access (JET) or Microsoft SQL Server Express database. The fact that the system is deployed on a single physical tier doesn t compromise the logical architecture and separation, as shown in Figure 1-2.
For instance, a Customer object may be responsible for adding and editing customer data. A CustomerInfo object in the same application may be responsible for providing read-only access to customer data. Both objects will use the same data from the same database and table, but they provide different behaviors. Similarly, an Invoice object may be responsible for adding and editing invoice data. But invoices include some customer data. A na ve solution is to have the Invoice object make use of the aforementioned Customer object, but that s not a good answer. That Customer object should only be used in the case where the application is adding or editing customer data something that isn t occurring while working with invoices. Instead, the Invoice object should directly interact with the customer data it needs to do its job. Through these two examples, it should be clear that sometimes multiple objects will use the same relational data. In other cases, a single object will use relational data from different data entities. In the end, the same customer data is being used by three different objects. The point, though, is that each one of these objects has a clearly defined responsibility that defines the object s behavior. Data is merely a resource the object needs to implement that behavior.
You can use the enumerators and enumerables generated by iterators wherever you would use manually coded enumerators or enumerables. In the following example, iterators are used to produce an enumerable class. Class ColorCollection has two enumerable iterators one enumerating the items in forward order and the other enumerating them in reverse order. using System; using System.Collections.Generic;
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