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The first character of a variable name must be either a letter, an underscore character ( _ ), or the at symbol ( @ ).
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Interfaces Vesus Abstract Classes:
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For example, you derive classes such as PassengerTrain , FreightTrain , and 424DoubleBogey , as shown in Figure 9 - 14
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A derived class named 424DoubleBogey was corrected to
T424DoubleBogey in the Answers.doc. Which was also mentioned at the website:
Beginning Visual C# Exercises - Chapter 09 Why not change the name to T424DoubleBogey? Was it intentional?
424DoubleBogey in chapter 9
