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The Do Loop Snippet
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To use the do loop snippet, type do and press TAB, TAB; you ll see the do loop template shown in Figure 2-21
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Figure 2-21 The C# do loop snippet template
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Figure 2-22 The VB do loop while snippet template
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Fill in the condition on the do loop and press ENTER, placing the carat in the do loop block For a VB Do snippet type , TAB, C, ENTER, C, ENTER, and use an arrow key to select the variant of Do loop that you want Figure 2-22 shows an example of the Do Loop While template
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Summary
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Working with languages is a core skill when building NET applications Two of the most used languages in NET are C# and VB, which is why this chapter is dedicated to those two languages You learned about types, expressions, statements, code blocks, conditions, and branching Additionally, you learned some of the essential features of VS for writing code, such as the code editor, bookmarks, Intellisense, and snippets 3 takes you to the next step in your language journey, teaching you about classes and the various members you can code as part of classes
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Key Skills & Concepts
Create Classes Write Methods Code Fields and Properties
type is a general term for classes, modules, enums, and more This chapter will specifically discuss the class type, which allows you to create your own custom types You ll also see the value of a class when you learn about class members You ll see how the field, method, and property class members can be used We ll start with learning how to create and use classes
Creating Classes
Previously, you learned about the primitive types, which are built into languages and alias the underlying NET types You can also create your own types, via classes, which you can instantiate and create objects with The following section explains how to create a class and then instantiate an object from it
Class Syntax
To create a new custom class definition, right-click the project, select Add | Class, name the class Employee for this example, and type the file extension cs for C# or vb for VB; then click Add (VS will add this file extension for you if you don t) You ll see a file with the same code as Listing 3-1
Listing 3-1 A new Employee class
using using using using System; SystemCollectionsGeneric; SystemLinq; SystemText;
namespace FirstProgram
3:
Learning Just Enough C# and VBNET: Types and Members
public class Employee { public string FirstName; } }
Public Class Employee Public Dim FirstName As String End Class
The C# Employee class is nearly the same as the Program class that you created in the preceding chapter, except that the class name here is Employee In VB, you ve only created a module before, and the Employee class is your first class for this book You can add members to a class, which could be events, fields, methods, and properties Listing 3-1 shows an example of a field, FirstName, and you ll learn about events, methods, and properties in later sections of this chapter A field is a variable in a class that holds information specific to that class Listing 3-2 shows how to instantiate an object of type Employee, which is your new custom type, and use it You would put this code inside of Main or another method You ll learn more about methods in the later section Writing Methods
Listing 3-2 Code that uses a class
Employee emp = new Employee(); empFirstName = "Joe";
Dim emp As New Employee empFirstName = "Joe"
In Listing 3-2, you can see that emp is a variable declared as type Employee The C# new Employee() or VB New Employee clause creates a new instance of Employee, and you can see that this new instance is being assigned to emp With that new instance, via the emp variable, you can access the Employee object, including its instance members In Listing 3-2, the FirstName field of that particular instance of Employee is assigned a string value of "Joe" Here you see that an object can contain data
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