Download Visual Basic

Michael Harper
Jasen Michalski
Mark Hudson
Problem Domain
Problem Domain
 Visual Basic was derived from BASIC
 Enables rapid application development of GUI
applications, access to databases, and creation of
ActiveX controls and objects.
 Microsoft stopped supporting Visual Basic in 2005,
focusing on Visual Basic .NET.
Problem Domain (ctd.)
 Visual Basic.NET is an evolution of Visual Basic,
implemented on the Microsoft .NET framework.
 Because of the .NET architecture earlier versions of
Visual Basic had to be re-written before they could be
used with .NET
 Visual Basic.NET dropped the .NET from it’s name in
Visual Basic 2005.
Problem Domain (ctd.)
 Vista will run Visual Basic 6 programs, but Microsoft
does not sell Visual Basic 6 anymore. They are
encouraging users to switch to VB.NET
History and Evolution
 Visual Basic 1.0 for DOS was released in September
1992. The interface was textual, using extend ASCII
characters to simulate the appearance of a GUI.
 Visual Basic 2.0 was released in November 1992. The
programming environment was easier to use, and its
speed was improved.
History and Evolution
 Visual Basic 3.0 was released in the summer of 1993
and came in Standard and Professional versions.
 Visual Basic 4.0 (August 1995) was the first version
that could create 32-bit as well as 16-bit Windows
programs. It also introduced the ability to write nonGUI classes in Visual Basic.
History and Evolution
 Visual Basic 5.0 (February 1997), Microsoft released
Visual Basic exclusively for 32-bit versions of Windows.
 Visual Basic 6.0 (Mid 1998) improved in a number of
areas, including the ability to create web-based
applications.
 Visual Basic .NET (2002) (VB7) – Microsoft released
VB.NET along with C# which received most of the
attention
History and Evolution
 Visual Basic .NET (2003) (VB 7.1) – Improvements
were made in the performance and reliability of
the .NET IDE
 Visual Basic 2005 (VB 8.0) – Microsoft dropped
the .NET portion of the title. Many improvements
were made to reinforce Visual Basic .NET as a rapid
application development platform and further
differentiate it from C#.
History and Evolution
 Visual Basic 2008 (VB 9.0) – released with the
Microsoft .NET Framework 3.5 on November 19, 2007.
Release included:
 True ternary operator If(boolean, value, value) to replace
IIF function
 Lambda expressions
 XML Literals
 Type Interface
Compared to C# and Java
C# AND Java
Virtual Basic
int i;
double d;
String s;
dim i As Integer
dim d As Double
dim s As String
if(a == b){
//Code
}
else{
//Code
}
if a = b then
‘Code
else
‘Code
end if
public class Hello{
//Code
}
Public Class Hello
‘Code
End Class
Comparison to VBScript
 Visual Basic is a Windows based programming
language for individually running applications
 VBScript is a scripting language mainly used to
design web sites
 Because of the way the purposes of these
languages, Visual Basic can be written in an
environment that aids in implementation whereas
VBScript can only be written in a plain text file
with no support
VB.NET Language Concepts
 Uses Me instead of this
 Does not use a ; for initialization
 Used as a code behind for ASP.NET
 Does not use standard escapes characters
 Sub same as a function
 Partial Classes
Bubble Sort Using VB
Sub bubblesort(ByRef need(), max_min As Boolean)
Dim now As Integer
Dim never As Boolean
Dim pick As Integer: pick = UBound(need)
Dim lower As Integer: lower = LBound(need)
For i = lower To pick
For j = lower To pick – 1
If need(j) > need(j + 1) = Not max_min Then
now = need(j): need(j) = need(j + 1): need(j + 1) = now
never = True
End If
Next j
If never = False Then Exit Sub Else never = False
Next i
End Sub
Verification of Data Example
Private Sub Emp_Name_AfterUpdate()
If Nz(DLookup("Emp_Name", "Employees", _
"Emp_Name='" & Me.Emp_Name & "'"), "zzzz") <> _
"zzzz" Then MsgBox & _
"That name already exists in the employee table.“
End Sub
Array Code Examples
Dim strData() As String = {"Joe Hasterman", "Ted Mattison", "Joe Rummel", "Brian _
Gurnure", "Doug Landal"}
Dim strMatrix(,) As String = {{"Red", "Green"}, {"Yellow", "Purple"}, {"Blue", "Orange"}}
Dim strMatrix(6) As String
strArray(0) = “Hello”
strArray(1) = “Help”
strArray(2) = “Hangover”
strArray(3) = “Happened”
strArray(4) = “Headache”
strArray(5) = “Aspirin”