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Description Returns the index of the first occurrence of item if item is contained within the invoking collection If item is not found, 1 is returned Inserts item at the index specified by index Removes the object at the index specified by index from the invoking collection

TABLE 25-11

In the last chapter, you learned four easy-to-use tactics to improve your writing You discovered how to achieve conciseness, enhance clarity, establish a positive tone, and maintain parallel construction In this chapter, we re going to look at the level of proofreading that is appropriate for your projects and discuss the types of errors, omissions, and inconsistencies for which you ll need to proof You ll also be alerted to the most common grammatical and punctuation errors found in business writing

Part II:

The IDictionary<TKey, TValue> interface defines the behavior of a generic collection that maps unique keys to values That is, it defines a collection that stores key/value pairs IDictionary<TKey, TValue> inherits IEnumerable, IEnumerable<KeyValuePair<TKey, TValue>>, and ICollection<KeyValuePair<TKey, TValue>> and is the generic version of the non-generic IDictionary The methods declared by IDictionary<TKey, TValue> are summarized in Table 25-12 All throw an ArgumentNullException if an attempt is made to specify a null key IDictionary<TKey, TValue> defines the following properties:

4x 2

Property ICollection Keys<TKey> { get; } ICollection Values<TValue> { get; } Description Obtains a collection of the keys Obtains a collection of the values

Notice that the keys and values contained within the collection are available as separate lists through the Keys and Values properties IDictionary<TKey, TValue> defines the following indexer: TValue this[TKey key] { get; set; } You can use this indexer to get or set the value of an element You can also use it to add a new element to the collection Notice that the index is not actually an index, but rather the key of the item

IEnumerable<T> and IEnumerator<T> are the generic equivalents of the non-generic IEnumerable and IEnumerator interfaces described earlier They declare the same methods and properties, and work in the same way Of course, the generic versions operate on data of the type specified by the type argument

Putting the right-hand side over a common denominator yields A( x 3) 2 + B( x + 2) ( x 3) + C ( x + 2) 1 = x 3 4x 2 3x + 18 x 3 4x 2 3x + 18 Of course the numerators must be equal, so 1 = A( x 3) 2 + B( x + 2) ( x 3) + C ( x + 2) We rearrange the equation as ( A + B) x 2 + ( 6A B + C ) x + ( 9A 6B + 2C 1) = 0 Since this must be an identity in x, we arrive at the system of equations A +B =0 =0

Method void Add(TKey key, TValue value)

Description Adds the key/value pair specified by key and value to the invoking collection An ArgumentException is thrown if key is already stored in the collection Returns true if the invoking collection contains key as a key Otherwise, returns false Removes the entry whose key equals key Attempts to retrieve the value associated with key, putting it into value Returns true if successful and false otherwise If key is not found, value is given its default value

bool ContainsKey(TKey key) bool Remove(TKey key) bool TryGetValue(TKey key, out TValue value)

Proofreading is a key part of producing effective business communications and needs to be integrated into the writing process Many people think that proofreading occurs once, at the end of the writing process In fact, most professional writers proofread early and often, knowing that they ll save their organizations time and money if they catch and correct errors promptly The Rule of Five demonstrates the point that the earlier you catch an error, the less time and money it will take to x the mistake While the speci c numbers aren t the issue, the dollar amounts quoted below are reasonable guesstimates, and it s the relative relationship of the numbers

TABLE 25-12

This system is easily solved to yield A = 1/25, B = 1/25, C = 1/5 As a result of these calculations, our integral can be transformed as follows: 1 dx = 3x + 18 1/25 dx + x+2 1/25 dx + x 3 1/5 dx ( x 3) 2