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The difference is subtle It s not that the rst lead is bad or wrong; rather, it is better to start with bene ts There are three approaches to writing a lead that work well in business communications: 1 Start with a time-sensitive word or phrase 2 Allude to a shared interest 3 Pose a question No matter which lead style you use, it s important that you think about the beginning of your communications

holds the result of the query { First; Second;

2S = (N + 1) + (N + 1) + + (N + 1) + (N + 1)

public ChrPair(char c, char c2) { First = c; Second = c2; } } class MultipleFroms { static void Main() { char[] chrs = { 'A', 'B', 'C' }; char[] chrs2 = { 'X', 'Y', 'Z' }; // Notice that the first from iterates over chrs and // the second from iterates over chrs2 var pairs = from ch1 in chrs from ch2 in chrs2 select new ChrPair(ch1, ch2); ConsoleWriteLine("All combinations of ABC with XYZ: "); foreach(var p in pairs) ConsoleWriteLine("{0} {1}", pFirst, pSecond); } }

The output is shown here:

One way to give a variable a value is through an assignment statement, as you have already seen Another way is by giving it an initial value when it is declared To do this, follow the variable s name with an equal sign and the value being assigned The general form of initialization is shown here: type var-name = value; Here, value is the value that is given to the variable when it is created The value must be compatible with the specified type Here are some examples:

int count = 10; // give count an initial value of 10 char ch = 'X'; // initialize ch with the letter X float f = 12F; // f is initialized with 12

Thus 2S = N (N + 1) or S= N (N + 1) 2

When declaring two or more variables of the same type using a comma-separated list, you can give one or more of those variables an initial value For example:

Although the preceding examples have used only constants as initializers, C# allows variables to be initialized dynamically, using any expression valid at the point at which the variable is declared For example, here is a short program that computes the hypotenuse of a right triangle given the lengths of its two opposing sides

// Demonstrate dynamic initialization using System; class DynInit static void // Length double s1 double s2 { Main() { of sides = 40; = 50;

Certain time-related words and phrases inspire action, such as now, today, before the deadline passes, right away, time is of the essence, and by the end of business today (or in an hour, or by any other speci ed deadline) This time-sensitive vocabulary creates a sense of urgency while maintaining a professional, business-like tone While the above and similar phrases create a sense of timeliness, try to avoid the clich d generic phrase as soon as possible (or its abbreviation, ASAP) It is ineffective Instead, integrate the effective words and phrases listed above into the content of your communications Consider the following examples:

This is a famous formula that was discovered by Carl Friedrich Gauss (1777--1855) when he was a child There is also evidence that the formula was known to the ancients II The sum S = 12 + 22 + + N2 = S=

// Dynamically initialize hypot double hypot = MathSqrt( (s1 * s1) + (s2 * s2) ); ConsoleWrite("Hypotenuse of triangle with sides " + s1 + " by " + s2 + " is "); ConsoleWriteLine("{0:####}", hypot); } }

Here is the output:

3:

Here, three local variables s1, s2, and hypot are declared The first two, s1 and s2, are initialized by constants However, hypot is initialized dynamically to the length of the hypotenuse Notice that the initialization involves calling MathSqrt( ) As explained, you can use any expression that is valid at the point of the initialization Since a call to MathSqrt( ) (or any other library method) is valid at this point, it can be used in the initialization of hypot The key point here is that the initialization expression can use any element valid at the time of the initialization, including calls to methods, other variables, or literals