Variables in .NET

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Variables
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Values are fine to use, if you know what the value is when you write your code However, most times the value isn't known until your ASPNET engine is ready to process a request Let's say that ASPNET needs to calculate the sales tax on the purchase price of an item You probably know the percentage value of the sales tax when you write the ASPNET web page, so you can write the value of the percentage into your code However, you don't know the purchase price of the item until the customer selects the item while your ASPNET web page runs This poses a dilemma How can you write the sales tax calculation into your code without knowing the purchase price of the item
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The solution is to use a variable in place of the purchase price Think of a variable as an empty cardboard box sitting on a table You place a label on the box on which you write a name You place a value inside the box Each time you want to refer to the value, you simply refer to the name of the box Let's return to our sales tax example to see how this works First we'll need a box to store the purchase price Let's write PurchasePrice on the label of the box We could write any name on the label, but it is less confusing if the name used represents the value stored inside the box Next, we'll write the math expression to calculate the sales tax
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TIP:The asterisk (*) is the symbol for multiplication
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Notice that we use the name on the label of the box when we're referring to the purchase price in this calculation We could have used the actual purchase price, but we don't know the purchase price until the customer enters the purchase price into the ASPNET web page Until then, all we can do is refer to the box where the purchase price will be stored When the ASPNET engine sees PurchasePrice in the code, it knows that Purchaseprice is a label for a box that contains the value of the purchase price The ASPNET engine then goes to the box, copies the value, replaces PurchasePrice with the value, and performs the calculation The box is actually a piece of computer memory The label on the box is a variable name and is used to refer to a location in computer memory
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Data Types: What Kind of Data I s i n the Box
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A variable is a temporary storage place-a box-in computer memory where values are placed while the ASPNET engine is processing a request You need to specify the type of information that can be placed into the box You do this by specifying a data type for the variable A data type describes the kind and range of values that can be placed into the box There are 15 date types in Visual Basic NET We are covering the ten data types that you'll use the most The ten data types that you'll need to know are:
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Integer
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As you learned previously in this chapter, an integer is a whole number An Integer data type specifies a temporary memory location that can hold a whole number
Variables and Expressions in ASPNET
However, the number must range from -2,147,483,648 to 2,147,483,647 Any number outside of this range won't fit into this location
Long
The Long data type specifies a temporary memory location that can hold a whole number within the range -9,223,372,036,854 to 9,223,372,036,854,775,807 This hold values smaller and greater than the Integer data type can hold
Short
The Short data type is used to store whole numbers in the range -32,768 to 32,767
Single
The Single data type is used to store mixed numbers, which are called floating point A mixed number contains both a whole number and a decimal value It can hold negative values ranging from -34028235E+38 through -140 1298E-45 and positive values ranging from 1401298E-45 through 34028235E+38
TIP: The E specijies the number of decimal places for the numbex For example,
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