generate barcode image vb.net 1: Introduction to C# NET and the NET Platform in Visual C#

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1: Introduction to C# NET and the NET Platform
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Before we leave this section, you also need to understand that these objects must be able to interact with each other You have probably realized by now that you will also have to create the mechanism to which the wheel is attached This means creating another design that contains properties and methods of its own When done, we will effectively have two objects one being a wheel and one a wheel mechanism The wheel may have to ask the wheel mechanism to loosen a bolt Just as you suspected, loosen a bolt will be a method of the wheel mechanism One object can request that another object perform one of its methods This is called sending a message to another object As long as the programmer has a handle for that object, the programmer can ask that object to do something that it knows how to do (perform one of its own methods) PART I
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Structs Explained
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We will take a moment out from talking about classes and objects to introduce the concept of a structure, or struct We do it in this chapter because it will be of significance in the next chapter when we discuss types Historically, a struct was a means of creating a user-defined type by combining several types together For example, you may wish to create an employee struct that has a first name, a last name, and a birth date By combining several fields or types together, you have effectively created a new type that can be accessed as a single entity Look at the following piece of code that describes an employee struct using the C language:
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struct employee
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char first_name[20];
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char last_name[20];
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int birthday;
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} emp1;
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Once the variable emp1 is created, you can access any member of the structure by using the variable name, a dot, and the required field for example, emp1first_name Notice that this closely resembles OOP, since we can include multiple properties for a single structure In C#, the struct continues the tradition of being a simple user-defined type As a matter of fact, it is very similar to a class, with the following exceptions: A struct does not support inheritance (a concept explained in 3) A struct is a value type, not a reference type, which means that it defines a value
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and not an object
A struct is stored on the stack, not on the heap like an object This provides for
faster performance because it can be accessed directly
NOTE Value types and reference types were discussed in the Data Types section earlier in the chapter, and will be discussed further, along with details on memory management and locations, in 2
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You would use a struct instead of a class file if you wished to create a small and simple data type that is similar in behavior to the built-in types of C#, such as Int, Char, or Double An important distinction between the structures found in C and the structs of C# is that C# structs are allowed to have methods defined as well as properties A typical C structure is only permitted to contain properties or fields Consider our employee struct, but this time in C#:
public struct Employee
public String firstName;
public String lastName;
public int birthday;
public void SayHappyBirthday (String Name)
SystemConsoleWriteLine ("Happy Birthday {0}!", Name);
NOTE Although a struct is allowed to contain methods, it is recommended that they do not Consider their purpose to form a user-defined type, or more precisely, to be a blueprint for a value A class is a blueprint for an object and therein lies the fundamental difference We will explore the differences between structs and classes as we move on in this book It is discussed here simply to complete the history of OOP
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We will now return to our original discussion of objects and classes The following code demonstrates the Fahrenheit to Celsius application built using OOP Don t concern yourself too much with the actual syntax and construction of the following class file; rather, explore the possibilities that are opened up by designing this code in an objectoriented fashion
using System;
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