asp.net core barcode scanner

asp.net core barcode scanner

asp net core barcode scanner

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This makes it important to use the correct type of built-in list for your application. Here s the procedure for creating any of the built-in list types: Caution

The base Control class incorporates a number of features and makes them available to all child controls. A quick list includes view-state management, control identification, naming container capabilities, design-time support, themes, control state, and adaptive rendering. If you choose to inherit from any of the classes in Table 12-1, be prepared to write quite a bit of code because the control you get in the beginning is not particularly rich with concrete functionalities. You typically inherit from any of those classes if you re going to write a control that provides unique capabilities that are hard to find in other ASP.NET controls. Inheriting from any of the classes in Table 12-1 is more like building a custom control from scratch, where the effective starting point is determined by the selected base class. If you opt for inheritance from a concrete control class that is, a control that provides an observable behavior and user interface you should strive to add new features or override existing capabilities without altering too much the structure and the personality of the control itself.

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Figure 23-2

26:

16:

I have often seen customers turn the auto update statistics option off and justify the action with the following claims:

7. Add the following using statement after the using System; statement at the top of the le:

<Description( The rotation angle for the brush ), DefaultValue(0)> _ Property RotateAngle() As Single Get Return m_RotateAngle End Get Set(ByVal Value As Single) m_RotateAngle = Value Me.Invalidate() End Set End Property Redefine the OnPaint event to account for the new property. Protected Overrides Sub OnPaint(ByVal e As PaintEventArgs) Create a gradient brush as large as the client area, with specified start/end color and gradient mode. Dim br As New LinearGradientBrush(Me.ClientRectangle, _ Me.StartColor, Me.EndColor, Me.GradientMode) Apply the rotation angle. br.RotateTransform(Me.RotateAngle) Paint the background and destroy the brush.

To create a backup device for the second file, use the following command:

Dim font3 As New Font( Arial", 16, FontStyle.Italic Or FontStyle.Underline)

InitializeAsymmetricAlgorithm(rsaCSP, c:\rsakey.xml", True)

Our Great Programmer says that there should be a special place in hell reserved for programmers who create identifiers like X24 or Cheese or count. She says that these tell a reader of the program code nothing about what the variable is being used for. She really likes identifiers like CarSpeed, backgroundColor, and accountBalance.

Every time the user selects a letter, the page downloads the list of all customers whose name begins with the letter. If the user clicks twice on, say, A, the list of customers is downloaded only once. Here s the script code that manages the clicking:

After you have a des gn that w work and doesn t ook stup d, don t worry too much beyond that You can make arguments that a g ven approach s better because t s eas er to extend, but f that extens on m ght never take p ace you m ght have wasted effort add ng that flex b ty When the Great Programmer s mak ng code, the most mportant cons derat ons for her are How easy s th s to understand and How easy s th s to test a ong w th How much w I get pa d and When do we get coffee

Dim hash As HashAlgorithm = HashAlgorithm.Create() Console.WriteLine(hash.GetType().Name) => SHA1CryptoServiceProvider

As you learned earlier in this chapter, using a URL to access a report and specify its parameter values isn t secure. A user can easily manipulate the URL to alter

Microsoft Windows Server 2003 Inside Out Note In step 9, you entered credentials for the backup selection script. In this step, you are entering credentials for the scheduled task.

Figure 12-2.

The new modifier applied to a property instructs the compiler that the current implementation for the member replaces any other implementation available on base classes. If you redefine the NavigateUrl property without using the new keyword, you simply receive a warning from the compiler. The warning informs you that you are hiding an existing member, and it just recommends the use of the new modifier if hiding the member was intentional.

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