1. Introduction 01_intro.ppt
CIS162AD - C#
Introduction 01_intro.ppt

2. Introduction to C# Software Development Life Cycle (SDLC)
C# History (brief)
Compiling Process
Categories of Programming Errors
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3. Programming Programming is solving a problem using a computer.
A program is a set of specific instructions for a computer to follow.
It is a complex process and each program takes on a life of it’s own called SDLC.
SDLC – Software Development Life Cycle
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4. SDLC Software Development Life Cycle (Program Development Cycle)
There are various methodologies to develop programs, but most follow the same process.
The actual name for each step in the process may vary by vendor.
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5. SDLC – 3 Phases, 8 Steps Problem Solving Phase Implementation Phase
Problem Definition
Algorithm Design
Implementation Phase
Build, Test, Install, and Train
Support Phase
Maintenance
Obsolete
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6. SDLC - Problem Solving Phase
Problem definition (Analysis of the task) Users need a form to do a Sales Order Calculation (qty, price, tax, freight)
Algorithm Design (Solution) Design the interface.
Desk check with common and extreme data. Programming language not necessarily selected yet.
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7. Problem Solving Diagrams
Analysis Diagrams / Tools
Data Flow Diagram (DFD)
Entity Relationship Diagrams (ERD)
Functional Descriptions
Use Case Diagrams (Object-Oriented)
Design Diagrams / Tools
Input Output Charts (IPO)
Flowcharts
Structure Charts
Class Diagrams (Object-Oriented)
Diagrams are independent of programming languages.
We will see some examples of design diagrams throughout the course.
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8. SDLC – Implementation Phase
Implement or Build (Code the program).
Test the program using test data. Actual output must match expected results.
Deploy or install May require data conversion or hardware upgrades.
Training & User Documentation.
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9. SDLC – Support Phase
Maintenance – change program as needed new tax rates, new freight carrier, zip+4, Y2K, new area code.
Obsolete – program is discarded due to requiring too much effort to correct or new technology (DOS -> Windows).
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10. In Homework Assignments…
You will be provided a
problem definition
You will
Design Algorithm
Build it
Test it
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11. Programming Categories
Object-Oriented Programming (OOP)
Emphasis is on identifying objects in a problem (student, faculty, etc).
Objects are then categorized into classes (person).
Classes are used in programs to create and manipulate objects. objCustomer = new clsCustomer;
Procedural Programming
Emphasis is on identifying the procedures or steps to solve a problem and then creating a program as the solution.
Event Programming
Usually related to GUI programming.
Program reacts to events, such as a user clicking on a mouse.
All of these techniques will be used throughout our C#.NET assignments.
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12. History of C#
In Microsoft released the .Net programming platform.
Microsoft included it’s new language C# (pronounced C-Sharp).
Roots are in C, C++, and Java.
.Net includes a rich library of pre-built components that are shared among the .Net languages such as Visual Basic (VB).
If you know VB, you should recognize some of the classes and methods that are used in C#.
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13. IDE Software C# programs are created in a GUI IDE .
GUI : Graphical User Interface
IDE : Integrated Development Environment
C# IDE provides the tools and capabilities to create very powerful and flexible programs.
Can create Forms, Classes, Programs, Database connections, and many other things.
The IDE includes a smart editor, compiler, linker, and debugger.
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14. Key Elements of a C# Program
Design the forms (user interface).
Design the methods that will be executed.
Create forms using various control objects.
Write methods that react to object events.
Each statement must end with a semi-colon.
Most blocks of code required an open and close brace { }. private void calculateButton_Click(…) { int intQuanity; decimal decPrice; }
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15. C# to Machine Language C# programs are typed in as text.
Programs have a .cs extension.
CS1Form.cs
Form Resources have a .resx extension.
CS1Form.resx
Must be converted to machine language.
How?
By compiling…
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16. Compiler and Linker Compiler Linker
Verifies the program is coded with commands it recognizes and that the proper syntax was used.
Creates an object file (machine language).
Linker
Combines the program’s object file with object code of standard routines from the library.
Creates the final executable file (.exe).
In the .Net Framework, Common Language Runtime (CLR) is the linker.
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17. Compiling IDE Editor CS1.cs Syntax Errors Warnings Compiler
Library Objects
Microsoft Intermediate Language (MSIL)
Common Language Runtime (CLR)
CS1.exe in memory
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18. Syntax There are several languages to choose from.
Each language has a set of commands that can be used.
Each language has a set of syntax rules that must be followed.
Syntax determines many things - like how commands are entered and how each command should end (period, semi-colon, etc).
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19. Three Categories of Errors
Syntax Errors and Warnings
Logic Errors
Run-time Errors
Actually are logic errors.
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20. Syntax Errors & Warnings
Detected by compiler.
Violation of grammar rules.
Mistyped command.
Compiler tells you what the error is or what it thinks it is.
Compiler tries to tell you where the error occurred.
Warnings
Passes syntax rules but not normally coded this way.
Programmer should check for possible logic error.
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21. Logic Errors Detected and corrected by programmer.
Program designed or written incorrectly.
Output generated does NOT match expected output.
Simple to very complex.
Using * (multiply) instead of + (add)
Test, test, test and verify results.
This is where programmers earn their money.
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22. Run-time Errors
Usually discovered by user, but corrected by programmer.
Program terminates unexpectedly.
Error: access violation …
Usually based on a logic error.
Divide by zero
Users do something programmer didn’t expect them to do.
Processing unexpected input, such as letters instead of numbers.
Users need to document what they were doing when the error occurred to help programmer.
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23. Summary Software Development Life Cycle (SDLC) # History
Compiling Process
Categories of Errors
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