Imports System
Namespace Hello
　 Class HelloWorld
　　　Overloads Shared Sub Main(ByVal args() As String)
　　　　 Dim name As String = "VB.NET"
　　　　 'See if an argument was passedfrom the command line
　　　　 If args.Length = 1 Then name = args(0)
　　　　　Console.WriteLine("Hello, " & name & "!")
　　　End Sub
　 End Class
End Namespace

using System;
namespace Hello {
　 public class HelloWorld {
　　　public static void Main(string[] args) {
　　　　 string name = "C#";
　 　　　// See if an argument was passed from thecommand line
　 　　　if (args.Length == 1)
　 　　　　 name = args[0];
　 　　　Console.WriteLine("Hello, " + name + "!");
　　　}
　 }
}

' Single line only
REMSingle line only
''' <summary>XML comments</summary>

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

Value Types
Boolean
Byte, SByte
Char
Short, UShort, Integer, UInteger, Long, ULong
Single, Double
Decimal
Date
　　
Reference Types
Object
String
　　
Initializing
Dim correct As Boolean = True
Dim b As Byte = &H2A 　'hex
Dim o As Byte = &O52 　'octal
Dim person As Object = Nothing
Dim name As String = "Dwight"
Dim grade As Char = "B"c
Dim today As Date = #12/31/2007 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
　　
Type Information
Dim x As Integer
Console.WriteLine(x.GetType())　　　　　'Prints System.Int32
Console.WriteLine(GetType(Integer)) 　' Prints System.Int32
Console.WriteLine(TypeName(x))　　　　' Prints Integer
　　
Type Conversion
Dim d As Single = 3.5
Dim i As Integer = CType(d, Integer)　 ' set to 4 (Banker's rounding)
i = CInt(d)　' same result as CType
i = Int(d)　　' set to 3 (Int function truncates the decimal)

Value Types
bool
byte, sbyte
char
short, ushort, int, uint, long, ulong
float,double
decimal
DateTime　 (not a built-in C#type)
　　
Reference Types
object
string
　　
Initializing
bool correct = true;
byte b = 0x2A; 　// hex
object person = null;
string name = "Dwight";
char grade = 'B';
DateTime today = DateTime.Parse("12/31/2007 12:15:00");
decimal amount = 35.99m;
float gpa = 2.9f;
double pi = 3.14159265;
long lTotal = 123456L;
short sTotal = 123;
ushort usTotal = 123;
uint uiTotal = 123;
ulong ulTotal = 123;
　　
Type Information
int x;
Console.WriteLine(x.GetType());　 　　　　　// Prints System.Int32
Console.WriteLine(typeof(int));　　　　　　 　// Prints System.Int32
Console.WriteLine(x.GetType().Name); 　// prints Int32
　　
Type Conversion
float d = 3.5f;
int i = (int)d;　 // set to3　(truncates decimal)

ConstMAX_STUDENTS As Integer = 25
　　
' Can set to a const orvar; may be initialized in a constructor
ReadOnly MIN_DIAMETER As Single = 4.93

const int MAX_STUDENTS = 25;
　　
// Can set to a const or var; may be initialized in a constructor
readonly float MIN_DIAMETER = 4.93f;

Enum Action
　Start
　[Stop]　' Stopis a reserved word
　Rewind
　Forward
End Enum
EnumStatus
　Flunk = 50
　Pass = 70
　Excel = 90
End Enum
Dim a As Action = Action.Stop
If a <> Action.Start Then _
　Console.WriteLine(a.ToString & " is " & a)　 　' Prints "Stop is 1"
Console.WriteLine(Status.Pass)　　' Prints 70
Console.WriteLine(Status.Pass.ToString())　　' Prints Pass

enum Action {Start, Stop, Rewind, Forward};
enum Status {Flunk = 50, Pass = 70, Excel = 90};
Action a = Action.Stop;
if (a != Action.Start)
　Console.WriteLine(a + " is " + (int) a);　　// Prints "Stop is 1"
Console.WriteLine((int) Status.Pass);　　// Prints 70
Console.WriteLine(Status.Pass);　　　// Prints Pass

Comparison
=　<　>　<=　>=　<>
　　
Arithmetic
+　-　*　/
Mod
"　(integer division)
^　(raise to a power)
　　
Assignment
=　+=　-=　*=　/=　"= ^=　<<= >>=　&=
　　
Bitwise
And 　Or 　Xor 　Not 　<< 　>>
　　
Logical
AndAlso 　OrElse 　And 　Or 　Xor 　Not
　　
Note: AndAlso and OrElse perform short-circuit logical evaluations
　　
String Concatenation
&

Comparison
==　<　>　<=　>=　!=
　　
Arithmetic
+　-　*　/
%　(mod)
/　(integer division if both operands are ints)
Math.Pow(x, y)
　　
Assignment
=　+=　-= *=　/= 　%=　&=　|=　^=　<<=　>>=　++　--
　　
Bitwise
& 　| 　^ 　~ 　<< 　>>
　　
Logical
&& 　|| 　& 　| 　^ 　!
　　
Note: && and||perform short-circuit logical evaluations
　　
String Concatenation
+

greeting = IIf(age < 20, "What's up?", "Hello")
　　
' One line doesn't require "End If"
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
If x <> 100 And y < 5 Then x *= 5 : y *= 2　
　　
' Preferred
If x <> 100 And y < 5 Then
　x *= 5
　y *= 2
End If
　　
' To break up any long single line use _
If whenYouHaveAReally < longLine And _
　itNeedsToBeBrokenInto2> LinesThen _
　UseTheUnderscore(charToBreakItUp)
　　
'If x > 5 Then
　x *= y
ElseIfx = 5 Then
　x += y
ElseIf x < 10 Then
　x -= y
Else
　x /= y
End If
　　
Select Case color　 ' Must be a primitive data type
　Case "pink", "red"
　　r += 1
　Case "blue"
　　b += 1
　Case "green"
　　g += 1
　Case Else
　　other += 1
End Select

greeting = age < 20 ? "What's up?" : "Hello";
　　
if (age < 20)
　greeting = "What's up?";
else
　greeting = "Hello";
　　
// Multiple statements must be enclosed in {}
if (x != 100 && y < 5) {　
　x *= 5;
　y *= 2;
}
　　
No need for _ or : since ; is used to terminate each statement.
　　
if (x > 5)
　x *= y;
else if (x == 5)
　x += y;
else if (x < 10)
　x -= y;
else
　x /= y;
　　
// Every case must end with break or goto case
switch (color){　　　　　　　　　　　　　// Must be integer or string
　case "pink":
　case "red":　　r++;　　break;
　case "blue":　 b++;　 break;
case "green": g++;　 break;
default:　　other++;　 break; 　　　// break necessary on default
}

Pre-test Loops:

Post-test Loops:

'　Array or collection looping
Dim names As String() = {"Fred", "Sue", "Barney"}
For Each s As StringIn names
　Console.WriteLine(s)
Next
　　
' Breaking out of loops
Dim i As Integer = 0
While (True)
　If (i = 5) Then Exit While
　i += 1
End While
　　
' Continue to next iteration
For i = 0 To 4
　If i < 4 Then Continue For
　Console.WriteLine(i) 　' Only prints 4
Next

Pre-test Loops:
　　
// no "until" keyword
while (c < 10)
　c++;
for (c = 2; c <= 10; c += 2)
　Console.WriteLine(c);
　　
Post-test Loop:
do
　c++;
while (c < 10);
　　
// Array or collection looping
string[] names = {"Fred", "Sue", "Barney"};
foreach (string s in names)
　Console.WriteLine(s);
　　
// Breaking out of loops
int i = 0;
while (true) {
　if (i == 5)
　　break;
　i++;
}
　　
// Continue to next iteration
for (i = 0; i < 5; i++) {
　if (i < 4)
　　continue;
　Console.WriteLine(i); 　// Only prints 4
}

Dim nums() As Integer = {1, 2, 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
Dim names(4) As String
names(0) = "David"
names(5) = "Bobby"　' Throws System.IndexOutOfRangeException
' Resize the array, keeping the existing values (Preserve is optional)
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, 2, 3};
for (int i = 0; i < nums.Length; i++)
　Console.WriteLine(nums[i]);
// 5 is the size of the array
string[] names = new string[5];
names[0] = "David";
names[5] = "Bobby";　 // Throws System.IndexOutOfRangeException
// C# can't dynamically resize an array.　Just copy into new array.
string[] names2 = new string[7];
Array.Copy(names, names2, names.Length);　 // or names.CopyTo(names2, 0);
　　
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)　
Sub TestFunc(ByVal x As Integer, ByRef y 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　
TestFunc(a, b, c)
Console.WriteLine("{0} {1} {2}", a, b, c)　 ' 12 5
　　
' Accept variable number of arguments
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#
Dim total As Integer = Sum(4, 3, 2, 1)　 ' returns 10
　　
' Optional parameters must belisted lastand must have a default value
Sub SayHello(ByVal name As String, Optional ByVal prefix As String = "")
　Console.WriteLine("Greetings, " & prefix & " " & name)
End Sub
SayHello("Strangelove", "Dr.")
SayHello("Madonna")

// Pass by value (in, default), reference (in/out), andreference (out)
void TestFunc(int x, ref int y, out int z) {
　x++;　
　y++;
　z = 5;
}
　　
int a = 1, b = 1, c;　// c doesn't need initializing
TestFunc(a, ref b, out c);
Console.WriteLine("{0} {1} {2}", a, b, c);　// 1 2 5
　　
// Accept variable number of arguments
int Sum(params int[] nums) {
　int sum = 0;
　foreach (int i in nums)
　　sum += i;
　return sum;
}
　　
int total = Sum(4, 3, 2, 1);　 // returns 10
　　
/* C# doesn'tsupport optional arguments/parameters.　Just create two different versions of the same function. */　
void SayHello(string name, string prefix) {
　Console.WriteLine("Greetings, " + prefix + " " + name);
}
void SayHello(string name) {
　SayHello(name, "");
}

Special character constants
vbCrLf, vbCr, vbLf, vbNewLine
vbNullString
vbTab
vbBack
vbFormFeed
vbVerticalTab
""
　　
' String concatenation (use & or +)
Dim school As String = "Harding" & vbTab
school = school & "University" ' school is "Harding (tab) University"
　　
' Chars
Dim letter As Char = school.Chars(0)　 ' letter is H
letter = Convert.ToChar(65)　　　　　　　 ' letter is A
letter = Chr(65)　　　　　　　　　　　　　　　　' same thing
Dim word() As Char = school.ToCharArray() ' word holds Harding
　　
' No string literal operator　
Dim msg As String = "File is c:"temp"x.dat"
　　
' String comparison
Dim mascot As String = "Bisons"
If (mascot = "Bisons") Then　' true
If (mascot.Equals("Bisons")) Then　 ' true
If (mascot.ToUpper().Equals("BISONS"))Then ' true
If (mascot.CompareTo("Bisons") = 0) Then　' true
　　
Console.WriteLine(mascot.Substring(2, 3)) ' Prints "son"
　　
' String matching
If ("John 3:16" Like "Jo[Hh]? #:*") Then 　'true
Imports System.Text.RegularExpressions 　' More powerful than Like
Dim r As New Regex("Jo[hH]. "d:*")
If (r.Match("John 3:16").Success) Then 　'true
　　
' My birthday: Oct 12, 1973
Dim dt As New DateTime(1973, 10, 12)
Dim s As String = "My birthday: " & dt.ToString("MMM dd, yyyy")
　　
' Mutable string
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"

Escape sequences
"r 　// carriage-return
"n 　// line-feed
"t 　// tab
"" 　// backslash
"" 　// quote
// String concatenation
string school = "Harding"t";
school = school + "University";　 // school is "Harding (tab) University"
　　
// Chars
char letter = school[0];　　　　　　// letter is H
letter = Convert.ToChar(65); 　　// letter is A
letter = (char)65;　　　　　　　　　　// same thing
char[] word = school.ToCharArray();　 // word holds Harding
　　
// String literal
string msg = @"File is c:"temp"x.dat";
// same as
string msg = "File is c:""temp""x.dat";
　　
// String comparison
stringmascot = "Bisons";
if (mascot == "Bisons")　　// true
if (mascot.Equals("Bisons"))　// true
if (mascot.ToUpper().Equals("BISONS"))　 // true
if (mascot.CompareTo("Bisons") == 0)　　// true
　　
Console.WriteLine(mascot.Substring(2, 3));　　// Prints "son"
　　
// String matching
// No Like equivalent - use regular expressions
using System.Text.RegularExpressions;
Regex r = new Regex(@"Jo[hH]. "d:*");
if (r.Match("John 3:16").Success) 　// true
　　
// My birthday: Oct 12, 1973
DateTime dt = new DateTime(1973, 10, 12);
string s = "My birthday: " + dt.ToString("MMM dd, yyyy");
　　
// Mutable string
System.Text.StringBuilder buffer = new System.Text.StringBuilder("two ");
buffer.Append("three ");
buffer.Insert(0, "one ");
buffer.Replace("two", "TWO");
Console.WriteLine(buffer);　　 // Prints "one TWO three"

' Throw an exception
Dim ex As New Exception("Something is really wrong.")
Throw ex　
　　
' Catch an exception
Try
　y = 0
　x = 10 / y
Catch ex As ExceptionWhen y = 0 ' Argument and When is optional
　Console.WriteLine(ex.Message)
Finally
　Beep()
End Try
　　
' Deprecated unstructured error handling
On Error GoTo MyErrorHandler
...
MyErrorHandler: Console.WriteLine(Err.Description)

// Throw an exception
Exception up = new Exception("Something is really wrong.");
throw up;　// ha ha
　　
// Catch an exception
try {
　y = 0;
　x = 10 / y;
}
catch (Exception ex) {　 // Argument is optional, no "When" keyword
　Console.WriteLine(ex.Message);
}
finally {
　// Requires reference to the Microsoft.VisualBasic.dll
　// assembly (pre .NET Framework v2.0)
　Microsoft.VisualBasic.Interaction.Beep();
}

Namespace Harding.Compsci.Graphics
　...
End Namespace
　　
' or
　　
Namespace Harding
　Namespace Compsci
　　Namespace Graphics
　　　...
　　End Namespace
　End Namespace
End Namespace
　　
Imports Harding.Compsci.Graphics

namespace Harding.Compsci.Graphics {
　...
}
　　
// or
　　
namespace Harding {
　namespace Compsci {
　　namespace Graphics {
　　　...
　　}
　}
}
　　
using Harding.Compsci.Graphics;

Accessibility keywords
Public
Private
Friend　　　　　　　　　　
Protected
Protected Friend
Shared
　　
' Inheritance
ClassFootballGame
　InheritsCompetition
　...
End Class
　　
' Interface definition
Interface IAlarmClock
　...
End Interface
　　
// Extending an interface
Interface IAlarmClock
　Inherits IClock
　...
End Interface
　　
// Interface implementation
Class WristWatch
　Implements IAlarmClock, ITimer
　 ...
End Class

Accessibility keywords
public
private
internal
protected
protected internal
static
　　
// Inheritance
classFootballGame : Competition {
　...
}
　　
// Interface definition
interface IAlarmClock {
　...
}
　　
// Extending an interface
interface IAlarmClock : IClock {
　...
}
　　
// Interface implementation
class WristWatch : IAlarmClock, ITimer {
　 ...
}

Class SuperHero
　Private_powerLevel As Integer
　Public Sub New()
　　_powerLevel = 0
　End Sub
　Public Sub New(ByVal powerLevel As Integer)
　　Me._powerLevel = powerLevel
　End Sub
　Protected Overrides Sub Finalize()
　' Desctructor code to free unmanaged resources
　　MyBase.Finalize()
　End Sub
End Class

class SuperHero {
　private int _powerLevel;
　public SuperHero() {
　　_powerLevel = 0;
　}
　public SuperHero(int powerLevel) {
　　this._powerLevel= powerLevel;
　}
　~SuperHero() {
　　// Destructor code to free unmanaged resources.
　　// Implicitly creates a Finalize method
　}
}

Dim hero As SuperHero = New SuperHero
' or
Dim hero As New SuperHero
　　
With hero
　.Name = "SpamMan"
　.PowerLevel = 3
End With
　　
hero.Defend("Laura Jones")
hero.Rest()　　 ' Calling Shared method
' or
SuperHero.Rest()
　　
Dim hero2 As SuperHero = hero　' Both reference the same object
hero2.Name = "WormWoman"
Console.WriteLine(hero.Name)　 ' Prints WormWoman
　　
hero = Nothing 　 ' Free the object
　　
If hero IsNothing 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
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" construct
hero.Name = "SpamMan";
hero.PowerLevel = 3;
　　
hero.Defend("Laura Jones");
SuperHero.Rest();　 // Calling static method
　　
SuperHero hero2 = hero;　 // Both reference the same object
hero2.Name = "WormWoman";
Console.WriteLine(hero.Name);　 // Prints WormWoman
　　
hero = null ;　 // Free the object
　　
if (hero == null)
　hero = new SuperHero();
　　
Object obj = new SuperHero();
if (obj is SuperHero)
　Console.WriteLine("Is a SuperHero object.");
　　
// Mark object for quick disposal
using (StreamReader reader = File.OpenText("test.txt")) {
　string line;
　while ((line = reader.ReadLine()) != null)
　　Console.WriteLine(line);
}

Structure StudentRecord
　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 StudentRecord = New StudentRecord("Bob", 3.5)
Dim stu2 As StudentRecord = stu　
stu2.name = "Sue"
Console.WriteLine(stu.name)　 ' Prints Bob
Console.WriteLine(stu2.name) ' Prints Sue

struct StudentRecord {
　public string name;
　public float gpa;
　public StudentRecord(string name, float gpa) {
　　this.name = name;
　　this.gpa = gpa;
　}
}
　　
StudentRecord stu = new StudentRecord("Bob", 3.5f);
StudentRecord stu2 = stu;　
stu2.name = "Sue";
Console.WriteLine(stu.name);　　// Prints Bob
Console.WriteLine(stu2.name);　 // Prints Sue

Private _size As Integer
Public Property Size() As Integer
　Get
　 Return _size
　End Get
　Set (ByVal Value As Integer)
　　If Value < 0 Then
　　　_size = 0
　　Else
　　　_size = Value
　　End If
　End Set
End Property
　　
foo.Size += 1

private int _size;
public int Size {
　get {
　　return _size;
　}
　set {
　　if (value < 0)
　　　_size = 0;
　　else
　　　_size = value;
　}
}
　　
foo.Size++;

Delegate Sub MsgArrivedEventHandler(ByVal message As String)
　　
Event MsgArrivedEvent As MsgArrivedEventHandler
　　
' or to define an event which declares a delegate implicitly
Event MsgArrivedEvent(ByVal message As String)
　　
AddHandler MsgArrivedEvent, AddressOf My_MsgArrivedCallback
' Won't throw an exception if obj is Nothing
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
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#
MsgArrivedEvent += new MsgArrivedEventHandler(My_MsgArrivedEventCallback);
MsgArrivedEvent("Test message");　　// Throws exception if obj is null
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, "Button was clicked", "Info",
　　MessageBoxButtons.OK, MessageBoxIcon.Information);
}

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
Console.WriteLine(name & " is " & age & " years old.")
Dim c As Integer
c = Console.Read() 　 'Read single char
Console.WriteLine(c)　 ' Prints 65 if user enters "A"

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.", name, age);
// or
Console.WriteLine(name + " is " + age + " years old.");
　　
int c = Console.Read();　// Read single char
Console.WriteLine(c);　　// Prints 65 if user enters "A"

' Write out to text file
Dim writer As StreamWriter = File.CreateText("c:"myfile.txt")
writer.WriteLine("Out to file.")
writer.Close()
　　
' Read all lines from text file
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
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
Dim binReader As New BinaryReader(File.OpenRead("c:"myfile.dat"))
str = binReader.ReadString()
num = binReader.ReadInt32()
binReader.Close()

// Write out to text file
StreamWriter writer = File.CreateText("c:""myfile.txt");
writer.WriteLine("Out to file.");
writer.Close();
　　
// Read all lines from text file
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
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
BinaryReader binReader = new BinaryReader(File.OpenRead("c:""myfile.dat"));
str = binReader.ReadString();
num = binReader.ReadInt32();
binReader.Close();