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In this chapter, you learned about errors and exceptions. Here are the key points to keep in mind: Errors and exceptions will always occur in your programs. Your code is split into a tree very much like a management hierarchy. The hierarchy contains two types of code: code that organizes and code that implements. Exceptions are caught using try/catch blocks. The finally block is used to execute code, regardless of whether an exception is thrown, and to reset state. Code that implements has the responsibility of throwing exceptions. Code that implements does not try to fix or swallow the exception. This means code that implements will implement a finally block to reset state, but usually not a catch block. Code that organizes has the responsibility of being aware that exceptions might occur. This means code that organizes will implement catch blocks to catch exceptions and process them. Usually, this code will not have a finally implementation, but it may filter exceptions. Exceptions can be filtered to determine which exceptions will be captured and which cannot be captured. You can help make your code exception-safe by implementing sandboxing functionality. Implement default state so that your code is easier to read and maintain. Code that implements an error that is a warning is typically organizational code and is used to fix an exception.

Table 4-1. SQL Server Data Types (Continued)

To apply what you ve learned in this chapter, here s what you can do, summed up in a single step: 1. Rewrite all of the code examples in 4 to be exception-safe.

the worksheet values shown in Figure 4-29.

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Stores a numerical Globally Unique Identifier (GUID) A GUID is guaranteed to be unique; this property makes it very useful in certain situations In this book, we prefer to generate unique identifiers using other methods, but it s good to know there are options Stores variable-length character data NVarChar stores Unicode data with a maximum length of 4,000 characters, and VarChar stores non-Unicode data with a maximum length of 8,000 characters This data type is best used for storing short strings (note their length limitations) without fixed lengths Stores fixed-length character data Values shorter than the declared size are padded with spaces NChar is the Unicode version and goes to a maximum of 4,000 characters, whereas Char can store 8,000 characters When the size of the strings to be stored is fixed, it s more efficient to use Char than VarChar Stores large character data.

t this point, you should be comfortable with writing basic C# code, but your coding style would solve problems directly without considering reusability or other more advanced concepts You could code yourself out of a wet paper bag, but once you were out of the bag, you would have no idea what to do next (In case you re interested, the phrase, You couldn t do [fill in topic] out of a wet paper bag implies that your skills in a certain area are so weak that a wet paper bag is more overpowering The reference to wet paper bag comes from the fact that wet paper bags have no holding power and will tear at the slightest nudging) This chapter focuses on reusing base functionality, where two classes share methods and properties in common to solve a particular problem.

NText is the Unicode version and has a maximum size of 1,073,741,823 characters Text has double this maximum size Using these data types can slow down the database, and it s generally recommended to use Char, VarChar, NChar, or NVarChar instead When adding Text or NText fields, their length is fixed to 16, which represents the size of the pointer that references the location where the actual text is stored not the size of the text itself The Text data type can be used to store large character data such as paragraphs, long product descriptions, and so on We won t use this data type in this book Stores binary data with a maximum length of 8,000 bytes Stores binary data of maximum 231 1 bytes Despite its name, this field can store any kind of binary data, not just pictures.

To demonstrate the concepts, we will create a simple currency exchange application This application will use object-oriented programming, a powerful set of techniques common in modern programming languages such as C# In this chapter, you ll learn about the following topics: Object-oriented programming: Object-oriented, often abbreviated as OO, refers to a way of building applications using instantiated types First, you define the type and its behavior Then, when instantiated, the type has a state When you are developing, you don t know the state of the object, so you can only guess at it Data member scopes: Types have methods, and methods can be called by other types But do you want to let all types call all of a type s methods Think of it as follows.

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