1. IS 135 Business Programming
.NET and Visual Studio
IS 135
Business Programming

2. .NET Framework The most recent MS announcement
An attempt to enter the “enterprise” arena
Good programmer tools
Excellent access to universal resources
Will allow many languages
Large Base Library for all languages

3. .NET Continued Only on Windows at the moment
However, the Intermediate Language (IL) that results from compilation is possibly machine independent
This portable executable (PE) is part of the familiar .EXE file

4. .NET Continued The idea is to create programs in .NET
Compile them in the “common language runtime” (CLR)… more later
The code is translated into native code
Any language that is compliant will run

5. .NET Continued
MS used existing concepts and improved on them to create .NET
It has: robust CLR
Extensive class library
Internet based inter process communication
Multiple languages

6. .NET Framework Operating System Web Forms WIN forms Web Services
Data Access
XML Classes
Base Classes
.NET Framework
Operating System

7. Class Library Saves you writing common routines
Contains over 2500 classes
Classes contain commonly used routines like printing, display etc
Available to all languages under .NET through CLR

8. .Net and C# Structure

9. Start Page

11. Programming Environment

12. Execution Screen

13. CLR- Simplify App Dev 2500 classes, programmer can reuse
Organizations can create their own reusable code
Memory management simple with auto garbage collection

14. CLR - Performance High level languages always worse than assembler
JIT compiles method into native code first
Next time it executes directly in native code
Allocation of memory is next available storage
Deallocation done by garbage collector

15. Why CLR? Without it, compiler has to create safety
But there are many compilers, some 3rd party
All languages do not have safety features
Some compiler implementations are slow

16. CLR Design Interpreter or compiler
Interpreter does work at runtime, slow
Modern systems, have front-end compiler, back-end runtime

17. CLR – Intermediate Language
Front end does all checking, creates IL
JIT can create reusable native code
Better runtime performance

18. CLR and JVM Java Virtual Machine widely used Very similar to CLR
Most important differences:
CLR supports many languages
Java implemented on many platforms

19. Types Other OOs call them a class
Abstraction of data and behavior together
Fields, methods, properties, events

20. Common Type System Provides wide range of modern operations
Shared by CLR, compilers, tools
Framework for cross-language operation
Integer 16 on some machines, 32 on others
Limited code reuse between languages
Each language has some types
CTS establishes rules for cross-language calls

21. Managed Data, Garbage Collect
CLR reserves a contiguous block for initialized data – Managed Heap
Fast allocation from it
Older languages had to search for available space
CLR performs deallocation as part of garbage collection
When memory is low, frees up unreferenced memory

22. Getting started … From Program select Visual Studio .NET
Be sure to select NEW PROJECT
Then Visual C# Project and
From the right hand window choose CONSOLE APPLICATION
In the bottom window change the NAME to your assignment number

23. OUR style Rules After USING statement, there are /// (comments)
Keep // but replace line 1 with YOUR NAME
After // in line 2 replace text with the assignment #
After // in line 3 replace text with DUE date
Always insert a comment after }
Ex: } // end namespace
Now look at the example…

24. Helpful Hints No semicolons when: Next character is a {
The current character is a }
The line of text is over 1 line long
For the next few weeks, every program will have a Main() method.

25. Example Please watch carefully… First we will enter VS, C#
Then we will modify the skeleton program
We will try to make it run
First compile (check syntax etc) Build solution
Correct errors
Run program Debug, Start w/o debugging
Check results
Print results (next slide)

26. How to print program, results
From Visual studio, print program
Run the program (Debug/Start)
With the output (black) screen visible:
press print screen on top of keyboard
on top left of black screen right click icon
press select all
again press copy
Start WORD, paste copied material there

27. Assignment 0 Due Date: NEXT CLASS
Write a program to display 3 lines of text.
Line 1 your name
Line 2 your grad year
Line 3 your major
Display instruction in C#:
Console.WriteLine(“XXX”);
(where XXX is the text to be displayed)

28. How to get started Turn off the monitor get paper and pen
What results are expected?
What data are you given?
Is that enough to produce output?
In English, list variables if needed
List steps needed to display results
ex: display my name
Write C# instructions
Turn on Monitor, enter program

29. Assignment 0a Due Date: Next Class
Write a program to allow user input for name, reason for taking course, and your major.

30. Develop logic Turn off the monitor get paper and pen
What output is expected?
What data are you given?
Is that enough to produce output?
In English, list variables if needed
List steps needed to meet user request
ex: allow user input for name
display my name …
Write C# instructions
Turn on Monitor, enter program

31. More on Input/Output Console.Readline(); Console.Write (or WriteLine);
Example:
string Name; // declare variable
Name=Console.ReadLine();
Console.WriteLine(“My name is ” + Name); or
Console.WriteLine(“My name is {0}”, Name);

32. More on Input/Output string name; string street; What would go here?
string city;
Console.Write(“Please enter your Name ”);
name = Console.ReadLine();
Console.Write(“Please enter your Street ”);
street = Console.ReadLine();
What would go here?
city = Console.ReadLine();
Console.WriteLine(“my bio {0} {1}, {2}”, name, street, city);
Output: my bio smith 123 street, ffld

33. Program Style We listed some // comments earlier
We also should have 4 sections in every program
// declare section (where you assign variables etc)
// input section (accept user input)
// computations (where you do calculations)
// display results
IN THAT ORDER

34. using System;
namespace WTprog1 {
// wt
// program 1
// due date: 1/31/05
class Class1
static void Main(string[] args)
// declare section
// input section
// computation section
// display section
{ // end Main
{ //end class
{ // end namespace