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In addition, Web applications frequently have code that is downloaded over the wire in such a way that users don t even realize that code is being installed on their machine Today, this code can perform any operation, including deleting files or sending e mail Users are right to be terrified of installing new applications because of the potential damage they can cause To make users comfortable, security must be built into the system so that users can explicitly allow or disallow code developed by various companies to access the system resources The NET Framework addresses the DLL hell issue in a big way, as you ll see as you read this chapter and 3 It also goes a long way toward fixing the problem of having an application s state scattered all over a user s hard disk.

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Note You can't use decimal places when defining stop positions You should use this worksheet primarily to experiment with different transparency settings for the plot area In the version provided on the CD-ROM, a pale yellow fill was defined with a transparency of 50 percent As a result, the background colors can still be identified relatively clearly (in an Excel chart, the chart area rather than the border provides the background for the plot area) See for yourself how the overall effect of the chart sometimes changes dramatically when you change the transparency of the plot area or change its color (and, in turn, its transparency) You can already tell, just by looking at this relatively simple practice file, that a huge range of options is available to you in this context, and that you could quite happily spend an entire afternoon experimenting with these .

This is a simple example, but you can probably imagine a program in which the information about the phone-number length is needed in many places. At the time you create the program, the employees all live in one country, so you need only seven digits for their phone numbers. As the company expands and branches are established in different countries, you ll need longer phone numbers. If you have parameterized, you can make the change in only one place: in the definition of the named constant LOCAL_NUMBER_LENGTH. As you might expect, the use of named constants has been shown to greatly aid program maintenance. As a general rule, any technique that centralizes control over things that might change is a good technique for reducing maintenance efforts (Glass 1991).

Even then, you d only come halfway close to finding out all that can be done and what works best visually All the more reason to proceed with caution here If your aim is to develop appropriate, coherent designs in a professional context, then you shouldn t ever allow the range of possible options to lead you into indecision, or let excessive tinkering cause you to lose sight of the simplest solution, which is also often the best Picture and Texture Fill Going strictly by the organizational structure of this chapter, the subject of picture and texture fills doesn t really belong in a discussion about coloring chart elements However, I want to include it here because the design principles, techniques, and effects are so similar to those that apply to the coloring of two-dimensional elements .

As you can see in Listing 7-5, when the page is loaded, the Page_Load event handler is called. If IsPostback returns True, the label text is changed to report the value of __EVENTTARGET and _EVENTARGUMENT. When the PostLink control is clicked, the page shown in Figure 7-3 is returned to the browser.

For example, unlike COM, components no longer require settings in the registry Unfortunately, applications still require shortcut links, but future versions of Windows may solve this problem As for security, the NET Framework includes a new security model called code access security Whereas Windows security is based around a user s identity, code access security is based around an assembly s identity So a user could decide to trust all assemblies published by Microsoft or not to trust any assemblies downloaded from the Internet As you ll see, the NET Framework enables users to control their machines, what gets installed, and what runs more than Windows ever did..

A sample/practice file is available for this section also: On the Companion CD Open the \Samples\0404_Stadiumxlsx file on the CD-ROM The 0404_Stadiumxlsx file contains visual representations of the attendance figures of a large stadium Here, the stadium operator is particularly keen to highlight the point that the 75,000-seat capacity was filled to an acceptable level at at least three out of 10 events, even though the attendance figures overall were rather low The workbook contains two sample charts, which will immediately strike you as being very different, even though they are based on the same data The solution in the Model 1 worksheet consists of a basic column chart, which largely uses simple default settings and has just one distinguishing feature; i e , a polynomial trendline .