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First, the PGPLOT module is included, which exports all the functionality we need into the current name space, hence we can use the functions just as described in the PGPLOT user s manual. We then set up some data to plot. Most of the PGPLOT calls require an array of X values and an array of Y values of the same length. Since we want to draw error bars as well, we define an array containing the error in the measurements in both the upward and downward directions, i.e., the total error is twice as large as the elements of the array. These arrays will be used later in the program in calls to pgpt() and pgerry(). It s now time to open a device to write to, and set up the environment:

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Figure 8-38. A logged-in user will see his personal profile page when viewing the main CB component.

@echo off setlocal set key=HKEY_CURRENT_USER\Software set key=%key%\Microsoft\Windows\CurrentVersion\Applets\Regedit reg.exe add %key% /v LastKey /d "" /f start regedit

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Versioning When a class is originally sealed, it can change to unsealed in the future without breaking compatibility . However, once a class is unsealed, you can never change it to sealed in the future as this would break all derived classes . In addition, if the unsealed class defines any unsealed virtual methods, ordering of the virtual method calls must be maintained with new versions or there is the potential of breaking derived types in the future . Performance As discussed in the previous section, calling a virtual method doesn t perform as well as calling a nonvirtual method because the CLR must look up the type of the object at runtime in order to determine which type defines the method to call . However, if the JIT compiler sees a call to a virtual method using a sealed type, the JIT compiler can produce more efficient code by calling the method nonvirtually . It can do this because it knows there can t possibly be a derived class if the class is sealed . For example, in the code below, the JIT compiler can call the virtual ToString method nonvirtually:

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<asp:XmlDataSource runat="server ID="MyXmlSource DataFile="data.xml /> <asp:TreeView runat="server DataSourceId="MyXmlSource"> <DataBindings> <asp:TreeNodeBinding Depth="0 DataMember="Department TextField="Name ValueField="DeptId /> <asp:TreeNodeBinding Depth="1 DataMember="Category TextField="Name ValueField="CategoryId /> <asp:TreeNodeBinding Depth="2 DataMember="Product TextField="Name ValueField="SKU /> </DataBindings> </asp:TreeView>

case morning: case afternoon:

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for the machine, not for the network as a whole Consequently, a System account process can't access network resources For many services, such as the UPS example mentioned earlier in this chapter, the security issues might never arise during development But if you're trying to share mapped memory from your service to the UI client application, for example, and your security isn't set correctly, you'll run into access-denied errors from your client applications as they attempt to map the shared memory Unfortunately, no amount of debugging will solve security problems; you have to make sure that you program both your services and your client applications with the security aligned correctly Complete Windows security programming is a book unto itself, so be prepared to spend some time planning your security programming from the beginning of development.

effort. All you have to do is write a custom data provider a class that inherits the MembershipProvider class which, in turn, inherits the ProviderBase class:

<head> <title>CaveatEmptor - Search items</title> <link href="screen.css" rel="stylesheet" type="text/css"/> </head> <body> <ui:include src="header.xhtml"/> <h:form> <span class="errors"><h:message for="itemSearchField"/></span> <div class="entry"> <div class="label">Enter item identifier:</div> <div class="input"> <h:inputText id="itemSearchField" size="3" required="true" value="#{itemEditor.itemId}"> <f:validateLongRange minimum="0"/> </h:inputText> </div> </div> <div class="entry">

Unity is another important goal in design. Unity means the entire application fits together as one. To achieve unity, gestalt principles are applied to these design elements: Space: is limited on the mobile display, yet it is important to avoid a cluttered, overcrowded display. Visual flow: ensures the user is guided through your application in a natural flow. Do not force the user to move from group to group in an unnatural direction. Dominance: describes where one element visually dominates the others on the display. Use dominance to grab the user s attention such as the active icon in a menu. Hierarchy: establishing a strong visual hierarchy can be extremely useful in indicating relationships between elements and in guiding the user through the content in a consistent and predictable manner.

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