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Visual Basic

Visual Basic. By Leo Karlo Primero. What is Visual Basic?. Understanding its foundation. De facto standard Founded in 1987 by MSDN Competition with other languages Version 2.0 made it popular Went up to 6 until it was called BASIC.NET Newest version is Visual Basic 2010.

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Visual Basic

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  1. Visual Basic By Leo Karlo Primero

  2. What is Visual Basic? Understanding its foundation • De facto standard • Founded in 1987 by MSDN • Competition with other languages • Version 2.0 made it popular • Went up to 6 until it was called BASIC.NET • Newest version is Visual Basic 2010

  3. What? Visual Basic is • A GUI • Graphics, tools, objects • An OOP – “*Object Oriented Programming” • Objects make the application. *Italics - Taken from Starting out with Visual Basic 2008 page 7

  4. Visual Basic is a LOL it’s a GUI It is A GUI – Graphic User Interface Can create graphics for interaction Between User and application Interaction: Text boxes, radio buttons, and more Screen shot of Visual Basic’s Integrated Development Environment

  5. Visual Basic is Object Oriented Objects to play around with Screen shot of VB tool box • It all begins with a web form… • Then place in any object unto it • A radio button, a text box, a progress bar, and anything… • They make application construction look so easy • Visual Basic makes programming faster

  6. Don’t take my word for it… Dan Mabbut, a BASIC language expert, said that “*excellent programs could be written faster and cheaper with Visual Basic than with any of those languages (C, C+ and Java).” *Italics - Taken from http://visualbasic.about.com/od/applications/a/whatisvb.htm

  7. How do you code in Visual Basic? First This code is an example of a class Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load cboDistributorNo.Items.Add(100) cboDistributorNo.Items.Add(101) cboModelNo.Items.Add("puri-clear") cboModelNo.Items.Add("Envirn_Safe") cboDistributorNo.SelectedIndex = 0 cboModelNo.SelectedIndex = 0 End Sub • Understand that each object has a class • Look to your right

  8. What is a class? • A class is a contemporary of an object • It makes up the object • Underneath it are its codes • Divided into subroutines • Describes how the process work • Main class is always at the top of the code • What this codes does is to place the numbers into the cboDistributorNo.Items • This can also be an option statement (rules of processing) • You are going to see its output Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load cboDistributorNo.Items.Add(100) cboDistributorNo.Items.Add(101) cboModelNo.Items.Add("puri-clear") cboModelNo.Items.Add("Envirn_Safe") cboDistributorNo.SelectedIndex = 0 cboModelNo.SelectedIndex = 0 End Sub

  9. Before and After… BEFORE… AFTER…

  10. A class and its codesis like a teacher and its students Class and codes A teacher instructs his student on what to do Poor guy… • A class cannot function without its codes • A class name will appear first • But no functions • It is an empty classroom with no activity • The teacher is bored (no brain activity) • A class needs codes to be active! • It will be bored like the teacher.

  11. Codes within classes are instances! • Instances are… • Data, string, procedures, events, calculations and etc. • They help make class work

  12. Coding part 1 – Naming conventions *“The first three letters of the name should be a lowercase prefix indicating the control’s type.“ Be serious about naming conventions… • No one wants a combo box to be called combName • Preferably called cboDistributorNo. • It speaks to us… • “I am a cbo Distributor No. a combo box that distributes numbers…” *Italics - Taken from Starting out with Visual Basic 2008 page 14

  13. Prefixes help • Visual Basic detects prefixes • Here is why

  14. Known prefix list • lbl = Label • txt = Text Box • cbo = Combo Box • btn = Button

  15. To give an object a name • Go to Properties Window • Find Name • Type in value

  16. Coding Part 2 – Assigning a Variable • A variable is an instance • You must dim it first • Ex: Public Class frmTuitionCalc Dim ResidenceStatus As Integer • Then follow it up with an As statement

  17. Coding Part 2 – Assigning a Variable How to Give it a value • To assign a value is simple… • Ex: ResidenceStatus = 0 • You can do the same with a string • Ex: lblDateString.Text = txtDayOfWeek.Text & ", " _ *What this does is that lblDateString.Text will have the same text as txtDayofWeek.Text • If you see a “.” assume it connects to a property

  18. lblDateString.Text = txtDayOfWeek.Text & ", " _ .Text is text property that will affect the highlighted area • Here is the output of it to show you what I am talking about • Look

  19. What happened was • At the last slide lblDateString.Text gathered all the textual data of the other variables and placed them in one string.

  20. Coding Part 3: Performing calculations • Operators: • + is addition • - is subtraction • *MOD gets remainder • / is *floating point division • \ is *Integer division • *^ is exponentiation • Examples Integer = 5 + 5; Integer = 5 MOD 5; (remainder shows) Integer = 5 / 5; *Italics -Taken from Starting out with Visual Basic 2008 page 122

  21. Coding Part 4: Converting between variable types Conversion Example *Dim anInteger As Integer = 54 MsgBox (CStr(anInteger)) This will convert anInteger = 54 to output as a string “54” • Convert between items • Use a Ctype function *Italics -Taken from http://msdn.microsoft.com/en-us/library/8bzk8e8c%28v=VS.90%29.aspx

  22. Coding Part 5: If…Then and If…Else…Then Statements Both statements are conditional statements Example Private Sub chkRush_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles chkRush.Click If chkRush.Checked Then rbtUPS.Enabled = True rbtSpecialCarrier.Enabled = True Else rbtUPS.Enabled = False rbtSpecialCarrier.Enabled = False End If End Sub • Visual Basic is unique on this • If… Then is one condition is met • If… Else… Then is if one condition is not met then another event will trigger

  23. Here is how it works Before After The code implies that if chkRush.Checked = True(Rush Order is checked) then rbtUPS (UPS radio button) and rbtSpecialCarrier (Special Carrier radio button) will be enabled (made usable)

  24. Coding Part 6: The Case Statement Another condition statement Example Private Sub rbtInternational_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles rbtInternational.Click ResidenceStatus = 2 End Sub Case Is >= 12 Select Case ResidenceStatus Case 0 Tuition = 1500 Case 1 Tuition = 2300 Case 2 Tuition = 3200 End Select *NOTE: This is a shortened version of the actual code • There can be several options • However a condition must be met for one of them to work

  25. How it works The code’s decision Here it is • User inputs hours taken • Then tuition will output base on a case • Typed-in 12 hours and checked International • International is Case 2 • Outputs $3,200

  26. My view on Visual Basic • I find it faster to finish applications but it takes time to learn. • The community is quite active • There are people helping each other online • I find it to be very reliable • A programmer can decide how to tighten his application’s security • I have a template that has a log-in feature • MSDN is still maintaining it with bug fixes and updates • As long as the user downloads them • When anyone needs help with Visual Basic he can ask help from MSDN • Visual Basic has its own Online Help • Visual Basic’s history has shown me that MSDN still updates it and even changes VB’s external and internal structures. • Visual Basic’s unique features made it an all-around programming language • Besides Programmers coded VB’s codes to create advanced applications • One major downside is that it does not focus on actual programming • People may not be programmers to use Visual Basic

  27. Outcome for Visual Basic • So far for what I see Visual Basic is persistent and may last for a very long time. • I believe that after it fixes up its problems Visual Basic will still have a lot of customers that are willing to quickly make applications.

  28. Works Cited Gaddis, Tony, and Kip Irvine. Starting out with Visual Basic 2008. Fourth. Boston: Pearson Education, Inc., 2008. 7. Print. Gaddis, Tony, and Kip Irvine. Starting out with Visual Basic 2008. Fourth. Boston: Pearson Education, Inc., 2008. 14. Print. Gaddis, Tony, and Kip Irvine. Starting out with Visual Basic 2008. Fourth. Boston: Pearson Education, Inc., 2008. 122. Print. n.p., "Closer Look: Converting from One Variable Type to Another." MSDN.Microsoft.com. MSDN, n.d. Web. 18 Apr 2010. <http://msdn.microsoft.com/en-us/library/8bzk8e8c%28v=VS.90%29.aspx> Mabbut, Dan. "What is Visual Basic?." VisualBasic.About.com. About.com, n.d.. Web. 18 Apr 2010. <http://visualbasic.about.com/od/applications/a/whatisvb.htm>.

  29. FIN GOD DESERVES THIS GLORY I am thankful that He helped me persevere through this. Praise Jesus

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