VB.Net Basic Reading And Writing

VB.Net Basic Reading And Writing

Imports System.IO

' Drag and Drop OpenFileDialog1 onto your form.

Public Class Form1

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

OpenFileDialog1.ShowDialog

End Sub

' Go to Designer and click the OpenFileDialog1 on the bottom.
' Go to the settings on the right.
' you will see a lightning bolt.

End Class

' Click on the lightning bolt.
' Double Click on 'FileOk'

 you will see a code snippet like this.
Private Sub OpenFileDialog1_FileOk(ByVal sender As System.Object, ByVal e As System.ComponentModel.CancelEventArgs) Handles OpenFileDialog1.FileOk

' Type this,
If File.Exist(OpenFileDialog1.FileName) Then
Dim ByteArray() As Byte = File.ReadAllBytes(OpenFileDialog1.FileName)

' Now we have the file in Bytes. Best Way to open it.
' Lest Save this File in a Different Location.
File.WriteAllBytes(InputBox("File Name"), ByteArray)
Else
MsgBox("File Does Not Exit")
End If

End Sub

' Simple use File. to get Files.
' or Directory. to get Folders.

VB.Net Arrays & Booleans

VB.Net Arrays & Booleans

Getting Started with Arrays. Simple Arrays:

Dim TempStringArray() As String = Split("Name1,Name2,Name3", ",")

' Result, TempStringArray(0) = "Name1", TempStringArray(1) = "Name2", TempStringArray(2) = "Name3".

Arrays start at 0 so a array of (Arrays(3)) Length is 4...

Booleans are very helpful.

Boolean can have 3 responses (True, False, Nothting(Null) or VbNull)

you can have an Array of any Object Types... etc

Dim TempIntArray(9) As Integer

' Getting the Length of a Array, there are to ways, Ubound() = the Length - 1
' Or TempIntArray.Length = 10
' Example:

' Ubound(TempIntArray) = 9
' TempIntArray.Length = 10

etc...

For I As Long = 0 To Ubound(TempIntArray)
TempIntArray(i) = i
Next

Vb.net For Statements & Loops

For Statements:

The Basic For Statement Looks like this:

Dim i As Long = 0
Dim x As Long = 0

For i = 0 To 10
x +=2
Next

MsgBox(x.ToString)

While Statements

Dim i As Long = 0
Dim ExitMe As Boolean = False

While ExitMe = False
i +=1
If i = 10 Then
ExitMe = True
End If
End While

Do Until

Dim i As Long = 10
Do Until (i < 0)
i-=1
loop

Vb.net If Statements

VB.Net If Statements

Example:

Dim X As Boolean = False

If X = False Then
Stop
Else
Exit Sub
End If

Dim Y As Long = 0

If Y = 0 Then
Stop
End If

Dim Z As DataBase = Nothing

If Z Is Nothing Then ' Answer is True.
Stop
End If

Dim L As Integer = 2

If L = 1 Or L = 2 Then ' Answer is True. Because L is 2
Stop
End If

Dim P As Long = 1

If P <> 0 Then
' True
End if

Dim O As Long = 9

If O >= 9 Then
' True
End If

VB.net Basic Variable Types

VB.net Variable Types:

To get started the first Variable type you will use is a Type Call "String", a string contains display variables, for example. VB.Net Contains 6 Characters, another Type is "Char" a char is a single Display Value for a Byte of Data. Example "a" is a char, Another type is Byte, byte is a numeric value for a Display Value. There are 0 - 255 Ascii Characters and Bytes in a default Ascii Table. Another Type is Integer, a numeric Value -2.142 billion To 2.142 billion.

Example:

Dim TempString As String = cStr("TempString")
Dim TempChar As Char = cChar("c")
Dim TempByte As Byte = cByte(10)
Dim TempInteger As Integer = 10