Variables and Expressions in ASPNET in Visual Studio .NET

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Variables and Expressions in ASPNET
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If you forget the order of operations, simply use parentheses to tell the ASPNET engine the order to evaluate an expression Portions of an expression that are enclosed within parentheses are evaluated before those portions that are outside of the parentheses Suppose you write the following expression but you are unsure which operation is performed first By placing parentheses around the addition expression, you force ASPNET to add those values before performing multiplication The value of this expression is 110:
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Concatenation
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Another operator that you'll probably use frequently is the concatenation operator, which is symbolized as & or + Concatenation means that one string is joined with another string to form a third string
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TIP: Remember that a string is a series of characters that are enclosed within quotations
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The following example shows how to do this Here we declare and initialize a variable called FullName We initialize it by concatenating two strings using the concatenation operator The value of FullName after concatenation is completed is "Bob Smith":
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TIP: Notice there is a space between the last b and the last quotation mark The
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space separates the first name from the last name when the words are joined together:
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Dim FullName As String
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"Bob
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Constants
You can use literal values such as the number 10 and the name "Bob" directly in your code as you've seen throughout this chapter However, there might be occasions when you want to use the same literal value over and over again within your code Let's say that your state sales tax is 6 percent and you need to use the state sales tax several times throughout your code One alternative is to simply use the literal value 06 whenever you need to refer to the sales tax in a calculation
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A better way is to define a constant as 06 and use the constant instead of the literal value 06 Developers prefer to use a constant to using a literal value for a couple of reasons First, a constant has a name that usually implies that purpose of the literal value that is represented by the constant For example, we could call the constant SalesTax This is more informative as you read your code than if you simply read the literal value 06 Another reason is that you can easily update your code should the value of the sales tax change Suppose you use the literal sales tax value in ten places within your code If the sales tax changes, you'll need to replace all ten values with the updated value This is time-consuming and leaves open the chance that you might overlook a few of those places If you use a constant, however, you only need to change this in one place-where you define the constant-and that change affects your entire code Here's how to declare a constant:
Const SalesTax As Single = 006
You'll notice that this statement is very similar to the statement used to declare a variable, except that we use Const instead of Dim Typically, you'll define a constant at the beginning of your code
Casting: Converting Data Types
As we mentioned previously in this chapter, there is a difference between 10 and "10" The first is a number, and the second is a string You can use a number in an arithmetical operations, but you can't use a string in arithmetic without first converting the string to a numeric data type In other words, remove the quotations from "10 The task of converting from one data type to another is called casting and is performed by calling an appropriate conversion function (see Table 4-4) Each function converts a literal value, the contents of a variable, or the results of an expression into a particular data type The function then returns the converted value Let's see how this works We'll convert "10" to the number 10, which is an Integer data type To do this, we'll use the CInt() function As you'll learn in later chapters, there are three parts to a function: Function name Arguments Return value
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