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Plain vanilla exception; a general container for all exceptions. When you get one of these exceptions, look at the Message property for the exact details. If you throw this type of exception, it is important to supply an easy-to-understand string to the exception constructor. Thrown if you call a method and one of the arguments is not valid. Typically, in the Message property you can find the problem with the arguments. If this exception is thrown, it is because the contents of the argument are wrong. Thrown if you call a method where one of the arguments is a null value. This could be because you are passing the null value to the method or one of the arguments has a null value. Thrown if you call a method where one of the arguments is not in the expected range. While this exception sounds similar to ArgumentException, it is more specialized and targets whether an argument is in an acceptable range. Check the documentation of the method or the method implementation on what the acceptable range is. If you throw this exception, note the valid range in the error message. Thrown if a mathematical error is generated. Thrown if you attempt to divide by zero. Thrown if the format of the parameter is not correct. For example, if a method expects a number to be formatted with a period and you use a comma, an exception is generated. Continued

This section is a quick database lesson that covers the essential information you need to know to design simple data tables. We ll briefly discuss the main parts that make up a database table: Primary keys UNIQUE columns SQL Server data types

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Thrown if you attempt to reference an index of an array that would be beyond the limits of the array. This exception is thrown if you have not allocated an array and then attempt to reference an element, or if you attempt to reference a negative index of the array. Thrown if not enough memory is available. Although this exception is not generated often, it can be generated if you attempt to allocate an array when you specify something along the lines of 5 trillion elements (due to an improperly assigned array size variable). Thrown if you attempt to cast one type to another type that is not supported. This exception is very common when you use inheritance and attempt a cast. Thrown when using methods or properties without an implementation. Often, you don t have time to implement all of the code at once. For those properties or methods that have not been implemented, don t leave an empty property or method implementation. Instead, throw an exception. Then you will know if you have forgotten to implement something. Thrown when you attempt to use an interface instance and a method that cannot work. For example, if you open a readwrite buffer to a read-only CD-ROM, you will get this exception when writing to the CD-ROM. If you attempt to read from the interface instance, an exception will not be thrown. Thrown when you attempt to call a method or property of a variable that has not been assigned with a valid type instance. Similar to InsufficientMemoryException. Thrown when you attempt to perform numeric operations that are not supported, such as adding 2 billion to 2 billion using a 32-bit integer. Thrown by the operating system. Do not attempt to derive from this class.

Note If you have enough experience with SQL Server, you might want to skip this section and go directly

Figure 4-27. The Weather worksheet (panes split for readability)

Now that you ve seen how to implement exception handlers, we ll look at an even better approach to exceptions: not generating them. We ll focus on how you can make your code safer and less likely to generate exceptions.

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