ASPONET 20 Demystified in .NET

Maker QR-Code in .NET ASPONET 20 Demystified

ASPONET 20 Demystified
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in the next chapter to tell your browser how to make decisions If you know how to add 1 + 1, then you will breeze through this chapter
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Values and Variables
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ASPNET web pages contain a lot of information along with a few pictures sprinkled about to catch your attention You place information that you want to display on the web page between a variety of HTML tags, such as between the open and close level-l heading tags, <hl> and dhl>Information placed on the screen is referred to as a value Some developers call this a literal because it is exactly the information you want displayed Values can also be placed in the code of your ASPNET web page
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As mentioned, any information that you place in the code of an ASP-NETweb page is called a value For example, "Hello world!" is a value The number 10 is also a value So is True, which is the value you assigned to the Visible property in the last chapter to make an HTML element visible on the web page As you can imagine, all kinds of values can be used in the code portion of your ASPNET application, depending on the nature of your application For example, a person's first name is a value and so is their street address Their user IDs and passwords are also values Values are grouped into four categories: numbers, strings, Boolean values, and dates
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Number
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A number is, well, a number that can be directly used in a calculation Numbers are written in code without enclosing them in double quotations For example, 10 is a number, which seems obvious until you run into something like this "10", which is a string and not a number value More about strings in a moment Numbers are further categorized as integers and decimal values An integer is a whole number that can be positive or negative That is, the number doesn't have a fractional component A decimal is a mixed number that can have a whole number and a decimal value It too can be positive or negative Developers refer to decimal values as floating-point values
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4 Variables and Expressions i n ASPNET
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A string is a series of characters that are enclosed within quotations "Hello, world!" is a string, and so is "121 Gordon Street" Notice that a string can contain numbers, but those numbers won't normally be used in a calculation However, numbers that are contained within a string can be used in a calculation if the string is converted to a number For example, " 1 0 is a string and not a number value Removing the quotations transforms the string into a number You'll learn how to convert strings to number values and number values to strings in the section "Casting: Converting Data Types" later in this chapter
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Boolean
A Boolean value is either true or false and cannot be any other value; it is written using the word True or False without placing it in quotations This can be a little confusing at first because the words True and False look as if they are strings and should be enclosed in quotations If you enter "True" in your code, you'll be entering a string If you enter True, you'll be entering a Boolean value Boolean values are used a lot for setting the property values of HTML elements You've seen this in the previous chapter, where you assigned True to the Visible property to make an HTML element appear on the web page
Date
A date value is a date or a portion of a date For example, 1/1/07 is a full date January is a portion of that date, as are the day and year Time is also considered part of a date A date is written using a standard date format and is enclosed within pound signs (#1/1/07#)
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