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The object reference has been set to null at the start of the code You may wonder why this is necessary when we talked about a Controls collection earlier in this chapter However, consider that there may be elements in the application that are not controls, and a Container object allows us to group everything together Our controls have been given reference variable names:

Consider a 10 g sample of a substance (Compound A) which is contaminated with a 5% impurity (Compound B) Another way to express this is to say that we have a mixture of 95 g Compound A and 05 g Compound B For the sake of discussion, let us say that both compounds happen to have the same solubility characteristics in methanol: 20 g /L at room temperature and 400 g/L at the boiling point of methanol Therefore, 25 mL of boiling methanol should be suf cient to completely dissolve the sample, since it would have the capacity to dissolve 10 g of each substance (400 g/L 0025 L = 10 g) After the solution has cooled to room temperature, however, the methanol can only hold 05 g in solution (20 g /L 0025 L = 05 g) Inasmuch as 05 g of each compound remains dissolved, 90 g of Compound A and none of Compound B should be present as a precipitate Thus, by simple ltration of this mixture Compound A can be obtained in pure form and 95% recovery (90 g recovered / 95 g originally = 095) With this example in mind, it is easy to see that recrystallization works best if the sample is already relatively pure Since Compound B is present in comparatively small amounts, its concentration is signi cantly lower than that of Compound A In fact, paradoxically, we can sometimes remove a less soluble component by this method if it is present in small enough quantity However, if we were presented with a 1:1 mixture of the compounds described above, the situation would not have been so straightforward

private SystemWindowsFormsLabel label1;

TIP You may want to assign your controls meaningful names at the beginning of the design Notice how difficult it will be now to go back and change the name of the label to something that represents its function, like labelStudentName The name can be changed in the Properties Explorer window under Design The Dispose() method is coded in order to perform any operations that are necessary when garbage collection is done Refer back to 2 to review the concept of garbage collection In this case, the Dispose() method is called on the components object In the InitializeComponent() method, the controls are instantiated and are set to their initial behavior Notice that the InitializeComponent() method is called from the constructor In this method, you will see the code that is created by changing the properties in the Properties Explorer window Figure 18-11 shows the Properties Explorer for our title label The Main() method is assigned as a single threaded apartment This ensures that drag and drop works properly and also allows the clipboard to function If you want to learn more about apartments and threading, read about threads in MSDN

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When the Internet came into being many computer generations ago, it was based on a couple of concepts: TCP/IP for the network protocol, and some simple protocols like HTTP (Hypertext Transfer Protocol) for the connections between web servers and web

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