// Single line
/* Multiple
line */
/// <summary>XML comments on single line</summary>
/** <summary>XML comments on multiple lines</summary> */@H_301_33@

Value Types@H_301_33@
Boolean
Byte,SByte
Char
Short,UShort,Integer,UInteger,Long,ULong
Single,Double
Decimal
Date (alias of System.DateTime)@H_301_33@

Reference Types@H_301_33@
Object
String

Initializing@H_301_33@
Dim correct As Boolean = True
Dim b As Byte = &H2A 'hex or &O52 for octal@H_301_33@
Dim person As Object = Nothing
Dim name As String = "Dwight"
Dim grade As Char = "B"c
Dim today As Date = #12/31/2010 12:15:00 PM#
Dim amount As Decimal = 35.99@
Dim gpa As Single = 2.9!
Dim pi As Double = 3.14159265
Dim lTotal As Long = 123456L
Dim sTotal As Short = 123S
Dim usTotal As UShort = 123US
Dim uiTotal As UInteger = 123UI
Dim ulTotal As ULong = 123UL

Nullable Types@H_301_33@
Dim x? As Integer = Nothing

Implicitly Typed Local Variables@H_301_33@
Dim s = "Hello!"
Dim nums = New Integer() {1,2,3}
Dim hero = New SuperHero With {.Name = "Batman"}

Type Information@H_301_33@
Dim x As Integer
Console.WriteLine(x.GetType()) 'Prints System.Int32@H_301_33@
Console.WriteLine(GetType(Integer)) ' Prints System.Int32@H_301_33@
Console.WriteLine(TypeName(x)) ' Prints Integer@H_301_33@

Dim c as New Circle
isShape = TypeOf c Is Shape ' True if c is a Shape@H_301_33@

isSame = o1 Is o2 // True if o1 and o2 reference same object@H_301_33@

Type Conversion / Casting@H_301_33@
Dim d As Single = 3.5
Dim i As Integer = CType(d,Integer) ' set to 4 (Banker's rounding)@H_301_33@
i = CInt(d) ' same result as CType@H_301_33@
i = Int(d) ' set to 3 (Int function truncates the decimal)@H_301_33@

Dim s As New Shape
Dim c As Circle = TryCast(s,Circle) ' Returns Nothing if type cast fails@H_301_33@
c = DirectCast(s,Circle) ' Throws InvalidCastException if type cast fails@H_301_33@

Value Types@H_301_33@
bool
byte,sbyte
char
short,ushort,int,uint,long,ulong
float,double
decimal
DateTime (not a built-in C#type)@H_301_33@

Reference Types@H_301_33@
object
string

Initializing@H_301_33@
bool correct = true;
byte b = 0x2A; // hex@H_301_33@
object person = null;
string name = "Dwight";
char grade = 'B';
DateTime today = DateTime.Parse("12/31/2010 12:15:00 PM");
decimal amount = 35.99m;
float gpa = 2.9f;
double pi = 3.14159265; // or 3.14159265D@H_301_33@
long lTotal = 123456L;
short sTotal = 123;
ushort usTotal = 123;
uint uiTotal = 123; // or 123U@H_301_33@
ulong ulTotal = 123; // or 123UL@H_301_33@

Nullable Types@H_301_33@
int? x = null;

Implicitly Typed Local Variables@H_301_33@
var s = "Hello!";
var nums = new int[] { 1,3 };
var hero = new SuperHero() { Name = "Batman" };

Type Information@H_301_33@
int x;
Console.WriteLine(x.GetType()); // Prints System.Int32@H_301_33@
Console.WriteLine(typeof(int)); // Prints System.Int32@H_301_33@
Console.WriteLine(x.GetType().Name); // prints Int32@H_301_33@

Circle c = new Circle();
isShape = c is Shape; // true if c is a Shape@H_301_33@

isSame = Object.ReferenceEquals(o1,o2) // true if o1 and o2 reference same object@H_301_33@

Type Conversion / Casting@H_301_33@
float d = 3.5f;
i = Convert.ToInt32(d); // Set to 4 (rounds)@H_301_33@
int i = (int)d; // set to 3 (truncates decimal)@H_301_33@


Shape s = new Shape();
Circle c = s as Circle; // Returns null if type cast fails@H_301_33@
c = (Circle)s; // Throws InvalidCastException if type cast fails@H_301_33@

' Can set to a const orvar; may be initialized in a constructor@H_301_33@
ReadOnly MIN_DIAMETER As Single = 4.93

// Can set to a const or var; may be initialized in a constructor@H_301_33@
readonly float MIN_DIAMETER = 4.93f;

Comparison@H_301_33@
= < > <= >= <>

Arithmetic@H_301_33@
+ - * /
Mod
\ (integer division)@H_301_33@
^ (raise to a power)@H_301_33@

Assignment@H_301_33@
= += -= *= /= \= ^= <<= >>= &=

Bitwise@H_301_33@
And Or Xor Not << >>

Logical@H_301_33@
AndAlso OrElse And Or Xor Not

Note: AndAlso and OrElse perform short-circuit logical evaluations

String Concatenation@H_301_33@
&

Comparison@H_301_33@
== < > <= >= !=

Arithmetic@H_301_33@
+ - * /
% (mod)@H_301_33@
/ (integer division if both operands are ints)@H_301_33@
Math.Pow(x,y)

Assignment@H_301_33@
= += -= *= /= %= &= |= ^= <<= >>= ++ --

Bitwise@H_301_33@
& | ^ ~ << >>

Logical@H_301_33@
&& || & | ^ !

Note: && and||perform short-circuit logical evaluations

String Concatenation@H_301_33@
+

' Null-coalescing operator if called with 2 arguments@H_301_33@
x = If(y,5) ' if y is not Nothing then x = y,else x = 5@H_301_33@

' Ternary/Conditional operator (IIf evaluates 2nd and 3rd expressions)@H_301_33@
greeting = If(age < 20,"What's up?","Hello")

' One line doesn't require "End If"@H_301_33@
If age < 20 Then greeting = "What's up?"
If age < 20 Then greeting = "What's up?" Else greeting = "Hello"

' Use : to put two commands on same line@H_301_33@
If x <> 100 AndAlso y < 5 Then x *= 5 : y *= 2

' Preferred@H_301_33@
If x <> 100 AndAlso y < 5 Then
x *= 5
y *= 2
End If

' Use _ to break up long single line or use implicit line break@H_301_33@
If whenYouHaveAReally < longLine And
itNeedsToBeBrokenInto2> LinesThen _
UseTheUnderscore(charToBreakItUp)

'@H_301_33@If x > 5 Then
x *= y
ElseIf x = 5 OrElse y Mod 2 = 0 Then
x += y
ElseIf x < 10 Then
x -= y
Else
x /= y
End If

Select Case color ' Must be a primitive data type@H_301_33@
Case "pink","red"
r += 1
Case "blue"
b += 1
Case "green"
g += 1
Case Else
other += 1
End Select

// Null-coalescing operator@H_301_33@
x = y ?? 5; // if y != null then x = y,else x = 5@H_301_33@

// Ternary/Conditional operator@H_301_33@
greeting = age < 20 ? "What's up?" : "Hello";

if (age < 20)
greeting = "What's up?";
else
greeting = "Hello";

// Multiple statements must be enclosed in {}@H_301_33@
if (x != 100 && y < 5) {
x *= 5;
y *= 2;
}

No need for _ or : since ; is used to terminate each statement.@H_301_33@

if (x > 5)
x *= y;
else if (x == 5 || y % 2 == 0)
x += y;
else if (x < 10)
x -= y;
else
x /= y;

// Every case must end with break or goto case@H_301_33@
switch (color){// Must be integer or string@H_301_33@
case "pink":
case "red": r++; break;
case "blue": b++; break;
case "green": g++; break;
default: other++; break; // break necessary on default@H_301_33@
}

' Array or collection looping@H_301_33@
Dim names As String() = {"Fred","Sue","Barney"}
For Each s As StringIn names
Console.WriteLine(s)
Next

' Breaking out of loops@H_301_33@
Dim i As Integer = 0
While (True)
If (i = 5) Then Exit While
i += 1
End While

' Continue to next iteration@H_301_33@
For i = 0 To 4
If i < 4 Then Continue For
Console.WriteLine(i) ' Only prints 4@H_301_33@
Next

Dim nums() As Integer = {1,3}
For i As Integer = 0 To nums.Length - 1
Console.WriteLine(nums(i))
Next

' 4 is the index of the last element,so it holds 5 elements@H_301_33@
Dim names(4) As String
names(0) = "David"
names(5) = "Bobby" ' Throws System.IndexOutOfRangeException@H_301_33@

' Resize the array,keeping the existing values (Preserve is optional)@H_301_33@
ReDim Preserve names(6)

Dim twoD(rows-1,cols-1) As Single
twoD(2,0) = 4.5

Dim jagged()() As Integer = { _
New Integer(4) {},New Integer(1) {},New Integer(2) {} }
jagged(0)(4) = 5

int[] nums = {1,3};
for (int i = 0; i < nums.Length; i++)
Console.WriteLine(nums[i]);


// 5 is the size of the array@H_301_33@
string[] names = new string[5];
names[0] = "David";
names[5] = "Bobby"; // Throws System.IndexOutOfRangeException@H_301_33@

// Add two elements,keeping the existing values@H_301_33@
Array.Resize(ref names,7);

float[,] twoD = new float[rows,cols];
twoD[2,0] = 4.5f;

int[][] jagged = new int[3][] {
new int[5],new int[2],new int[3] };
jagged[0][4] = 5;

' Pass by value (in,default),reference (in/out),andreference (out)@H_301_33@
Sub TestFunc(ByVal x As Integer,ByRefy As Integer,ByRef z As Integer)
x += 1
y += 1
z = 5
End Sub

Dim a = 1,b = 1,c As Integer ' cset to zero by default@H_301_33@
TestFunc(a,b,c)
Console.WriteLine("{0} {1} {2}",a,c) ' 12 5@H_301_33@@H_301_33@

' Accept variable number of arguments@H_301_33@
Function Sum(ByVal ParamArray nums As Integer()) As Integer
Sum = 0
For Each i As Integer In nums
Sum += i
Next
End Function ' Or use Return statement like C#@H_301_33@

Dim total As Integer = Sum(4,3,1) ' returns 10@H_301_33@

' Optional parameters must belisted lastand must have a default value@H_301_33@
Sub SayHello(ByVal name As String,Optional ByVal prefix As String = "")
Console.WriteLine("Greetings," & prefix & " " & name)
End Sub

SayHello("Strangelove","Dr.")
SayHello("Mom")

Special character constants (all also accessible from ControlChars class)@H_301_33@
vbCrLf,vbCr,vbLf,vbNewLine
vbNullString
vbTab
vbBack
vbFormFeed
vbVerticalTab
""

' String concatenation (use & or +)@H_301_33@
Dim school As String = "Harding" & vbTab
school = school & "University" ' school is "Harding (tab) University"@H_301_33@
school &= "University" ' Same thing (+= does the same)@H_301_33@

' Chars@H_301_33@
Dim letter As Char = school.Chars(0) ' letter is H@H_301_33@
letter = "Z"c ' letter is Z@H_301_33@
letter = Convert.tochar(65) ' letter is A @H_301_33@
letter = Chr(65)' same thing
@H_301_33@Dim word() As Char = school.tocharArray() ' word holds Harding@H_301_33@

' No string literal operator@H_301_33@
Dim filename As String = "c:\temp\x.dat"

' String comparison@H_301_33@
Dim mascot As String = "Bisons"
If (mascot = "Bisons") Then ' true@H_301_33@
If (mascot.Equals("Bisons")) Then ' true@H_301_33@
If (mascot.ToUpper().Equals("BISONS"))Then ' true@H_301_33@
If (mascot.CompareTo("Bisons") = 0) Then ' true@H_301_33@

' String matching with Like - Regex is more powerful@H_301_33@
If ("John 3:16" Like "Jo[Hh]? #:*") Then 'true@H_301_33@

' Substring@H_301_33@
s = mascot.Substring(2,3)) ' s is "son"@H_301_33@

' Replacement@H_301_33@
s = mascot.Replace("sons","nomial")) ' s is "Binomial"@H_301_33@

' Split@H_301_33@
Dim names As String = "Michael,Dwight,Jim,Pam"
Dim parts() As String = names.Split(",".tocharArray()) ' One name in each slot@H_301_33@

' Date to string@H_301_33@
Dim dt As New DateTime(1973,10,12)
Dim s As String = "My birthday: " & dt.ToString("MMM dd,yyyy") ' Oct 12,1973@H_301_33@

' Integer to String@H_301_33@
Dim x As Integer = 2
Dim y As String = x.ToString() ' y is "2"@H_301_33@

' String to Integer@H_301_33@
Dim x As Integer = Convert.ToInt32("-5") ' x is -5@H_301_33@

' Mutable string
@H_301_33@Dim buffer As New System.Text.StringBuilder("two ")
buffer.Append("three ")
buffer.Insert(0,"one ")
buffer.Replace("two","TWO")
Console.WriteLine(buffer) ' Prints "one TWO three"@H_301_33@

Escape sequences@H_301_33@
\r // carriage-return@H_301_33@
\n // line-Feed@H_301_33@
\t // tab@H_301_33@
\\ // backslash@H_301_33@
\" // quote@H_301_33@

// String concatenation@H_301_33@
string school = "Harding\t";
school = school + "University"; // school is "Harding (tab) University"@H_301_33@
school += "University"; // Same thing@H_301_33@

// Chars@H_301_33@
char letter = school[0]; // letter is H@H_301_33@
letter = 'Z'; // letter is Z@H_301_33@
letter = Convert.tochar(65); // letter is A@H_301_33@
letter = (char)65;// same thing
@H_301_33@char[] word = school.tocharArray(); // word holds Harding@H_301_33@

// String literal@H_301_33@
string filename = @"c:\temp\x.dat"; // Same as "c:\\temp\\x.dat"@H_301_33@

// String comparison@H_301_33@
stringmascot = "Bisons";
if (mascot == "Bisons") // true@H_301_33@
if (mascot.Equals("Bisons")) // true@H_301_33@
if (mascot.ToUpper().Equals("BISONS"))// true@H_301_33@
if (mascot.CompareTo("Bisons") == 0) // true@H_301_33@

// String matching - No Like equivalent,use Regex@H_301_33@

// Substring@H_301_33@
s = mascot.Substring(2,3)) // s is "son"@H_301_33@

// Replacement@H_301_33@
s = mascot.Replace("sons","nomial")) // s is "Binomial"@H_301_33@

// Split@H_301_33@
string names = "Michael,Pam";
string[] parts = names.Split(",".tocharArray()); // One name in each slot@H_301_33@

// Date to string@H_301_33@
DateTime dt = new DateTime(1973,12);
string s = dt.ToString("MMM dd,yyyy"); // Oct 12,1973@H_301_33@

// int to string@H_301_33@
int x = 2;
string y = x.ToString(); // y is "2"@H_301_33@

Imports System.Text.RegularExpressions

' Match a string pattern@H_301_33@
Dim r As New Regex("j[aeIoU]h?. \d:*",RegexOptions.IgnoreCase Or _
RegexOptions.Compiled)
If (r.Match("John 3:16").Success) Then 'true@H_301_33@
Console.WriteLine("Match")
End If

' Find and remember all matching patterns@H_301_33@
Dim s As String = "My number is 305-1881,not 305-1818."
Dim r As New Regex("(\d+-\d+)")
Dim m As Match = r.Match(s) ' Matches 305-1881 and 305-1818@H_301_33@
While m.Success
Console.WriteLine("Found number: " & m.Groups(1).Value & " at position " _
& m.Groups(1).Index.ToString)
m = m.NextMatch()
End While

' Remeber multiple parts of matched pattern@H_301_33@
Dim r As New Regex("(\d\d):(\d\d) (am|pm)")
Dim m As Match = r.Match("We left at 03:15 pm.")
If m.Success Then
Console.WriteLine("Hour: " & m.Groups(1).ToString) ' 03@H_301_33@
Console.WriteLine("Min: " & m.Groups(2).ToString) ' 15@H_301_33@
Console.WriteLine("Ending: " & m.Groups(3).ToString) ' pm@H_301_33@
End If

' Replace all occurrances of a pattern@H_301_33@
Dim r As New Regex("h\w+?d",RegexOptions.IgnoreCase)
Dim s As String = r.Replace("I heard this was HARD!","easy") ' I easy this was easy!@H_301_33@

' Replace matched patterns@H_301_33@
Dim s As String = Regex.Replace("123 < 456","(\d+) . (\d+)","$2 > $1")' 456 > 123@H_301_33@

' Split a string based on a pattern@H_301_33@
Dim names As String = "Michael,Pam"
Dim r As New Regex(",\s*")
Dim parts() As String = r.Split(names) ' One name in each slot@H_301_33@

using System.Text.RegularExpressions;

// Match a string pattern@H_301_33@
Regex r = new Regex(@"j[aeIoU]h?. \d:*",RegexOptions.IgnoreCase |
RegexOptions.Compiled);
if (r.Match("John 3:16").Success) // true@H_301_33@
Console.WriteLine("Match");

// Find and remember all matching patterns@H_301_33@
string s = "My number is 305-1881,not 305-1818.";
Regex r = new Regex("(\\d+-\\d+)");
// Matches 305-1881 and 305-1818@H_301_33@
for (Match m = r.Match(s); m.Success; m = m.NextMatch())
Console.WriteLine("Found number: " + m.Groups[1] + " at position " +
m.Groups[1].Index);

// Remeber multiple parts of matched pattern@H_301_33@
Regex r = new Regex("@(\d\d):(\d\d) (am|pm)");
Match m = r.Match("We left at 03:15 pm.");
if (m.Success) {
Console.WriteLine("Hour: " + m.Groups[1]); // 03@H_301_33@
Console.WriteLine("Min: " + m.Groups[2]); // 15@H_301_33@
Console.WriteLine("Ending: " + m.Groups[3]); // pm@H_301_33@
}

// Replace all occurrances of a pattern@H_301_33@
Regex r = new Regex("h\\w+?d",RegexOptions.IgnoreCase);
string s = r.Replace("I heard this was HARD!","easy")); // I easy this was easy!@H_301_33@

// Replace matched patterns@H_301_33@
string s = Regex.Replace("123 < 456",@"(\d+) . (\d+)","$2 > $1"); // 456 > 123@H_301_33@

// Split a string based on a pattern@H_301_33@
string names = "Michael,Pam";
Regex r = new Regex(@",\s*");
string[] parts = r.Split(names); // One name in each slot@H_301_33@

' Throw an exception@H_301_33@
Dim ex As New Exception("Something is really wrong.")
Throw ex

' Catch an exception@H_301_33@
Try
y = 0
x = 10 / y
Catch ex As ExceptionWhen y = 0 ' Argument and When is optional@H_301_33@
Console.WriteLine(ex.Message)
Finally
Beep()
End Try

' Deprecated unstructured error handling@H_301_33@
On Error GoTo MyErrorHandler
...
MyErrorHandler: Console.WriteLine(Err.Description)

// Throw an exception@H_301_33@
Exception up = new Exception("Something is really wrong.");
throw up; // ha ha @H_301_33@

// Catch an exception@H_301_33@
try {
y = 0;
x = 10 / y;
}
catch (Exception ex) { // Argument is optional,no "When" keyword@H_301_33@
Console.WriteLine(ex.Message);
}
finally {
Microsoft.VisualBasic.Interaction.Beep();
}

Namespace Harding.Compsci.Graphics
...
End Namespace

' or@H_301_33@

Namespace Harding
Namespace Compsci
Namespace Graphics
...
End Namespace
End Namespace
End Namespace

Imports Harding.Compsci.Graphics

namespace Harding.Compsci.Graphics {
...
}

// or@H_301_33@

namespace Harding {
namespace Compsci {
namespace Graphics {
...
}
}
}

using Harding.Compsci.Graphics;

Access Modifiers@H_301_33@
Public
Private
Friend
Protected
Protected Friend

Class Modifiers@H_301_33@
MustInherit
NotInheritable

Method Modifiers@H_301_33@
MustOverride
NotInheritable
Shared
Overridable

' All members are Shared@H_301_33@
Module

' Partial classes@H_301_33@
Partial Class Competition
...
End Class

' Inheritance@H_301_33@
ClassFootballGame
Inherits Competition
...
End Class

' Interface definition@H_301_33@
Interface IAlarmClock
Sub Ring()
Property TriggerDateTime() As DateTime
End Interface

' Extending an interface@H_301_33@
Interface IAlarmClock
Inherits IClock
...
End Interface

' Interface implementation@H_301_33@
Class WristWatch
Implements IAlarmClock,ITimer

Public Sub Ring() Implements IAlarmClock.Ring
Console.WriteLine("Wake up!")
End Sub

Public Property TriggerDateTime As DateTime Implements IAlarmClock.TriggerDateTime
...
End Class

Access Modifiers@H_301_33@
public
private
internal
protected
protected internal

Class Modifiers@H_301_33@
abstract
sealed
static

Method Modifiers@H_301_33@
abstract
sealed
static
virtual

No Module equivalent - just use static class@H_301_33@

// Partial classes@H_301_33@
partial class Competition {
...
}

// Inheritance@H_301_33@
classFootballGame : Competition {
...
}

// Interface definition@H_301_33@
interface IAlarmClock {
void Ring();
DateTime CurrentDateTime { get; set; }
}

// Extending an interface@H_301_33@
interface IAlarmClock : IClock {
...
}

// Interface implementation@H_301_33@
class WristWatch : IAlarmClock,ITimer {

public void Ring() {
Console.WriteLine("Wake up!");
}

public DateTime TriggerDateTime { get; set; }
...
}

class SuperHero : Person {

private int powerLevel;
private string name;


// Default constructor@H_301_33@
public SuperHero() {
powerLevel = 0;
name = "Super Bison";
}

public SuperHero(int powerLevel)
: this("Super Bison") { // Call other constructor@H_301_33@
this.powerLevel = powerLevel;
}

public SuperHero(string name)
: base(name) { // Call base classes' constructor@H_301_33@
this.name = name;
}

static SuperHero() {
// Static constructor invoked before 1st instance is created@H_301_33@
}

~SuperHero() {
// Destructor implicitly creates a Finalize method@H_301_33@
}

}

Dim hero As SuperHero = New SuperHero
' or@H_301_33@
Dim hero As New SuperHero

With hero
.Name = "SpamMan"
.PowerLevel = 3
End With

hero.Defend("Laura Jones")
hero.Rest() ' Calling Shared method@H_301_33@
' or@H_301_33@
SuperHero.Rest()

Dim hero2 As SuperHero = hero ' Both reference the same object@H_301_33@
hero2.Name = "WormWoman"
Console.WriteLine(hero.Name) ' Prints WormWoman@H_301_33@

hero = Nothing ' Free the object@H_301_33@

If hero Is Nothing Then _
hero = New SuperHero

Dim obj As Object = New SuperHero
If TypeOf obj Is SuperHero Then _
Console.WriteLine("Is a SuperHero object.")

' Mark object for quick disposal@H_301_33@
Using reader As StreamReader = File.OpenText("test.txt")
Dim line As String = reader.ReadLine()
While Not line Is Nothing
Console.WriteLine(line)
line = reader.ReadLine()
End While
End Using

SuperHero hero = new SuperHero();

// No "With" but can use object initializers@H_301_33@
SuperHero hero = new SuperHero() { Name = "SpamMan",PowerLevel = 3 };

hero.Defend("Laura Jones");
SuperHero.Rest(); // Calling static method@H_301_33@

SuperHero hero2 = hero; // Both reference the same object@H_301_33@
hero2.Name = "WormWoman";
Console.WriteLine(hero.Name); // Prints WormWoman@H_301_33@

hero = null ; // Free the object@H_301_33@

if (hero == null)
hero = new SuperHero();

Object obj = new SuperHero();
if (obj is SuperHero)
Console.WriteLine("Is a SuperHero object.");

Structure Student
Public name As String
Public gpa As Single

Public Sub New(ByVal name As String,ByVal gpa As Single)
Me.name = name
Me.gpa = gpa
End Sub
End Structure

Dim stu As Student = New Student("Bob",3.5)
Dim stu2 As Student = stu

stu2.name = "Sue"
Console.WriteLine(stu.name) ' Prints Bob@H_301_33@
Console.WriteLine(stu2.name) ' Prints Sue@H_301_33@

Student stu = new Student("Bob",3.5f);
Student stu2 = stu;

stu2.name = "Sue";
Console.WriteLine(stu.name); // Prints Bob@H_301_33@
Console.WriteLine(stu2.name); // Prints Sue@H_301_33@

' Auto-implemented properties are new to VB10@H_301_33@
Public Property Name As String
Public Property Size As Integer = -1 ' Default value,Get and Set both Public@H_301_33@

' Traditional property implementation@H_301_33@
Private mName As String
Public Property Name() As String
Get
Return mName
End Get
Set(ByVal value As String)
mName = value
End Set
End Property

' Read-only property@H_301_33@
Private mPowerLevel As Integer
Public ReadOnly Property PowerLevel() As Integer
Get
Return mPowerLevel
End Get
End Property

' Write-only property@H_301_33@
Private mHeight As Double
Public WriteOnly Property Height() As Double
Set(ByVal value As Double)
mHeight = If(value < 0,mHeight = 0,mHeight = value)
End Set
End Property

// Auto-implemented properties@H_301_33@
public string Name { get; set; }
public int Size { get; protected set; } // Set default value in constructor@H_301_33@

// Traditional property implementation@H_301_33@
private string name;
public string Name {
get {
return name;
}
set {
name = value;
}
}

// Read-only property@H_301_33@
private int powerLevel;
public int PowerLevel {
get {
return powerLevel;
}
}

// Write-only property@H_301_33@
private double height;
public double Height {
set {
height = value < 0 ? 0 : value;
}
}

Delegate Sub MsgArrivedEventHandler(ByVal message As String)

Event MsgArrivedEvent As MsgArrivedEventHandler

' or to define an event which declares a delegate implicitly@H_301_33@
Event MsgArrivedEvent(ByVal message As String)

AddHandler MsgArrivedEvent,AddressOf My_MsgArrivedCallback
' Won't throw an exception if obj is Nothing
@H_301_33@RaiseEvent MsgArrivedEvent("Test message")
RemoveHandler MsgArrivedEvent,AddressOf My_MsgArrivedCallback

Imports System.Windows.Forms

Dim WithEvents MyButton As Button ' WithEvents can't be used on local variable@H_301_33@
MyButton = New Button

Private Sub MyButton_Click(ByVal sender As System.Object,_
ByVal e As System.EventArgs) Handles MyButton.Click
MessageBox.Show(Me,"Button was clicked","Info",_
MessageBoxButtons.OK,MessageBoxIcon.Information)
End Sub

delegate void MsgArrivedEventHandler(string message);

event MsgArrivedEventHandler MsgArrivedEvent;

// Delegates must be used with events in C#@H_301_33@


MsgArrivedEvent += new MsgArrivedEventHandler(My_MsgArrivedEventCallback);
MsgArrivedEvent("Test message"); // Throws exception if obj is null@H_301_33@
MsgArrivedEvent -= new MsgArrivedEventHandler(My_MsgArrivedEventCallback);

using System.Windows.Forms;

Button MyButton = new Button();
MyButton.Click += new System.EventHandler(MyButton_Click);

private void MyButton_Click(object sender,System.EventArgs e) {
MessageBox.Show(this,
MessageBoxButtons.OK,MessageBoxIcon.Information);
}

' Enforce accepted data type at compile-time @H_301_33@
Dim numbers As New List(Of Integer)
numbers.Add(2)
numbers.Add(4)
DisplayList(Of Integer)(numbers)

' Subroutine can display any type of List @H_301_33@
Sub DisplayList(Of T)(ByVal list As List(Of T))
For Each item As T In list
Console.WriteLine(item)
Next
End Sub

' Class works on any data type@H_301_33@
Class SillyList(Of T)
Private list(10) As T
Private rand As New Random

Public Sub Add(ByVal item As T)
list(rand.Next(10)) = item
End Sub

Public Function GetItem() As T
Return list(rand.Next(10))
End Function
End Class

' Limit T to only types that implement IComparable@H_301_33@
Function Maximum(Of T As IComparable)(ByVal ParamArray items As T()) As T
Dim max As T = items(0)
For Each item As T In items
If item.CompareTo(max) > 0 Then max = item
Next
Return max
End Function

// Enforce accepted data type at compile-time @H_301_33@
List<int> numbers = new List<int>();
numbers.Add(2);
numbers.Add(4);
DisplayList<int>(numbers);

// Function can display any type of List @H_301_33@
void DisplayList<T>(List<T> list) {
foreach (T item in list)
Console.WriteLine(item);
}

// Class works on any data type@H_301_33@
class SillyList<T> {
private T[] list = new T[10];
private Random rand = new Random();

public void Add(T item) {
list[rand.Next(10)] = item;
}

public T GetItem() {
return list[rand.Next(10)];
}
}

// Limit T to only types that implement IComparable@H_301_33@
T Maximum<T>(params T[] items)where T : IComparable<T> {
T max = items[0];
foreach (T item in items)
if (item.CompareTo(max) > 0)
max = item;
return max;
}

Dim nums() As Integer = {5,8,1,6}

' Get all numbers in the array above 4@H_301_33@
Dim results = From value In nums
Where value > 4
Select value

Console.WriteLine(results.Count()) ' 3@H_301_33@
Console.WriteLine(results.First()) ' 5@H_301_33@
Console.WriteLine(results.Last()) ' 6@H_301_33@
Console.WriteLine(results.Average()) ' 6.33333@H_301_33@

' Displays 5 8 6 @H_301_33@
For Each n As Integer In results
Console.Write(n & " ")
Next

results = results.Intersect({5,6,7}) ' 5 6@H_301_33@
results = results.Concat({5,5}) ' 5 6 5 1 5@H_301_33@
results = results.Distinct() ' 5 6 1@H_301_33@

Dim Students() As Student = {
New Student With {.Name = "Bob",.GPA = 3.5},
New Student With {.Name = "Sue",.GPA = 4.0},
New Student With {.Name = "Joe",.GPA = 1.9}
}

' Get an ordered list of all students by GPA with GPA >= 3.0@H_301_33@
Dim goodStudents = From s In Students
Where s.GPA >= 3.0
Order By s.GPA Descending
Select s

Console.WriteLine(goodStudents.First.Name) ' Sue@H_301_33@

Console.Write("What's your name? ")
Dim name As String = Console.ReadLine()
Console.Write("How old are you? ")
Dim age As Integer = Val(Console.ReadLine())
Console.WriteLine("{0} is {1} years old.",name,age)
' or@H_301_33@
Console.WriteLine(name & " is " & age & " years old.")

Dim c As Integer
c = Console.Read() 'Read single char@H_301_33@
Console.WriteLine(c) ' Prints 65 if user enters "A"@H_301_33@

Console.Write("What's your name? ");
string name = Console.ReadLine();
Console.Write("How old are you? ");
int age = Convert.ToInt32(Console.ReadLine());
Console.WriteLine("{0} is {1} years old.",age);
// or@H_301_33@
Console.WriteLine(name + " is " + age + " years old.");

int c = Console.Read(); // Read single char@H_301_33@
Console.WriteLine(c); // Prints 65 if user enters "A"@H_301_33@

Imports System.IO

' Write out to text file@H_301_33@
Dim writer As StreamWriter = File.CreateText("c:\myfile.txt")
writer.WriteLine("Out to file.")
writer.Close()

' Read all lines from text file@H_301_33@
Dim reader As StreamReader = File.OpenText("c:\myfile.txt")
Dim line As String = reader.ReadLine()
While Not line Is Nothing
Console.WriteLine(line)
line = reader.ReadLine()
End While
reader.Close()

' Write out to binary file@H_301_33@
Dim str As String = "Text data"
Dim num As Integer = 123
Dim binWriter As New BinaryWriter(File.OpenWrite("c:\myfile.dat"))
binWriter.Write(str)
binWriter.Write(num)
binWriter.Close()

' Read from binary file@H_301_33@
Dim binReader As New BinaryReader(File.OpenRead("c:\myfile.dat"))
str = binReader.ReadString()
num = binReader.ReadInt32()
binReader.Close()

using System.IO;

// Write out to text file@H_301_33@
StreamWriter writer = File.CreateText("c:\\myfile.txt");
writer.WriteLine("Out to file.");
writer.Close();

// Read all lines from text file@H_301_33@
StreamReader reader = File.OpenText("c:\\myfile.txt");
string line = reader.ReadLine();
while (line != null) {
Console.WriteLine(line);
line = reader.ReadLine();
}
reader.Close();

// Write out to binary file@H_301_33@
string str = "Text data";
int num = 123;
BinaryWriter binWriter = new BinaryWriter(File.OpenWrite("c:\\myfile.dat"));
binWriter.Write(str);
binWriter.Write(num);
binWriter.Close();

// Read from binary file@H_301_33@
BinaryReader binReader = new BinaryReader(File.OpenRead("c:\\myfile.dat"));
str = binReader.ReadString();
num = binReader.ReadInt32();
binReader.Close();