ie 423 – design of decision support systems
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IE 423 – Design of Decision Support Systems
Visual StudioIntroduction to VB.NET programming
Important Events
Keepin Up
Read Pol and Ahuja – Chapter 10 – Visual
Studio Pol and Ahuja – Chapters 11-13
DSS Application Programming
Spreadsheets, Databases, etc. are tools to support decision makingYou still need a delivery systemsSometimes you can build a delivery system within a tool – like Access…but it often involves some programming
DSS Application Programming
We will be using Visual Basic.NET Don’t worry about the .NET part yet
VB programming model Object Oriented Programming Event-driven programming
DSS Application Programming
Object Oriented Programming As oppose to ? Focus on objects as the major
organizing principle for the software …rather than the procedure or
algorithm as the organizing principle In part, it is about how you think
about the program and its design
DSS Application Programming
Object Oriented Programming Objects are things in the program Objects have attributes, usually called
Properties Properties have a name and one or more
values Values can change or be set by your
program
DSS Application Programming
Object Oriented Programming Objects have actions, called Methods
Methods are things that the object do,… …or have done to them Methods are components of objects
Not independent
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Event-driven Programming Events are things that can happen to
objects In VB many events are predefined
(click) …but you can define others Code (program code – the code that
you are going to write) is associated with events
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So, how do you start thinking about developing a program?
What’s the “old” way?
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What’s the “old” way?Procedural Programming What to do to start. What to do next …and next …and next if this or that …and next And wrap it up
DSS Application Programming
Consider an exchange rate calculatorPrint “Welcome to the Exchange Rate Calculator”Get exchangerate !get todays rateInput “Enter amount in US Dollars”, amtforeignamt = amt * exchangeratePrint amt, “in this foreign currency = “, foreignamtend
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Previous slide is an example of procedural programming Why?
Alternative – Object Oriented Programming
How is this different?
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Procedural vs Object Oriented programmingProduct might be the sameFrom a functional (I/0) standpoint, could you produce the same program either way?Two important differences Thinking Implementation
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What are the objects in your problem and your design? Some problem specific Some are UI objects
What are the properties of these objects?What should happen when events happen to these objects?
DSS Application Programming
Note: your programming language must support object oriented, event-driven programmingVisual BasicVisual C++Visual C#C++ (object oriented)
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Visual Studio A place to make movies? A place to make music videos? A type of apartment with big
windows?
IDE – Interactive Development Environment
DSS Application Programming
Visual Studio IDE An environment to create and edit software …to run and test the software Has many, many tools to make software
development easier Controls (?) Windows Web Servers
Helps manage software development Configuration management
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Visual Studio IDE You can run your software in Visual
Studio When it is finished and tested you can
make a standalone software package
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Visual Studio IDE Mostly for MicroSoft Development
products
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