Introduction to C#

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Lee Englestone

Introduction to C# given to WISE (Women In Software Engineering)

Software

©2022 Avanade Inc. All Rights Reserved. <Highly Confidential> 1
Introduction to C#
Lee Englestone, Developer Relations Lead
Audience: Women In Software Engineering (WISE)
Date: October 2023

©2022 Avanade Inc. All Rights Reserved. <Highly Confidential> 2
Contents
2. What?
What is C#?
3. How?
How does it work?
4. Why?
Why use C#?
5. Try it!
Try it for yourself!
6. Summary
More information
and next steps
1. Introduction
Hi there 👋

3
About Me
VisualStudioTips.co.uk
Start-Coding.com
HackathonTips.com
GoodBusinessBooks.com
Many, many more..
Follow me on Engage!
Lee Englestone, Grp Mgr
Developer Relations Lead
20+ years Software Developer
4x Microsoft MVP
MSc Entrepreneurship Management & Innovation

4
EmTech &
Open Innovation
OCTO
(Office of the CTO)
EmTech
(Emerging Technology)
Open Innovation
Developer Relations
GSA (Global Solution Area)

©2022 Avanade Inc. All Rights Reserved. <Highly Confidential> 5
What is C#?
• Programming language
• Free & easy (and tooling)
• Cross platform
• Wide range of uses https://try.dot.net/

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.NET Framework
• Programming Languages
• Class Libraries
• Runtime

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C# Everywhere
Gaming
Desktop/
Laptops
applications
Web & Cloud
IoT
Tablets
iOS & Android phones
Virtual Reality
Augmented Reality

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Popularity
C# is a very popular programming language
https://survey.stackoverflow.co/2023/#technology

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Example Application Types
Console Application
Simple, powerful, basic UI & Input
Web Application
Typical website
Windows Application
Think Calculator app
Windows Service
No UI, runs in the background
Azure Cloud Function
Simple scalable app in the cloud
Web API
Web Application Programming
Interface – A callable web service
Mobile App
To run on mobile phones / tables
Game
A 2D or 3D game

©2022 Avanade Inc. All Rights Reserved. <Highly Confidential> 10
My example side projects that use C#
XamarinARKit.com

11
A look at C#
• Variables & data types
• Logic control
• Building blocks
• Namespaces
You can follow along on try.dot.net

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Variables
Storing temporary items of information
Can use built-in data types or user defined data types

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String
Declaration, manipulation and concatenation

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Boolean
true or false

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Numbers
Various min / max sizes and precision

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Numbers Continued

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DateTime

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Control statements
Don’t always want..
Do A, then B, then C, then D

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Collections, Lists, Arrays etc
Storing collections of variables in a variable
Array List Dictionary

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Loops & Iterations
Doing things multiple times
foreach
for for while do do while

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User defined types
Define your own types by combining existing types

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Properties and Methods
Both built in types and user defined types

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Common Namespaces
System
System.Math
System.Text
System.File
System.Globalisation

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Exercise: How many Tuesdays are there in 2023?
• Start with a date on 1st of January 2023
• Have an int counter
• Loop until 2024
• Each day check if day is a Tuesday
• If so, increment a counter

©2022 Avanade Inc. All Rights Reserved. <Highly Confidential> 25
Exercise: What are the dates of all the Tuesdays in 2023?
• Same, but add the date to a collection
• Iterate through collection and display them

©2022 Avanade Inc. All Rights Reserved. <Highly Confidential> 26
Tooling
Visual Studio
https://visualstudio.microsoft.com/#vs-section
Visual Studio Code
https://visualstudio.microsoft.com/#vscode-section
LinqPad
https://www.linqpad.net/
Rider
https://www.jetbrains.com/rider/

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In Browser Tutorial
https://dotnet.microsoft.com/en-us/learn/dotnet/in-browser-tutorial/1

©2022 Avanade Inc. All Rights Reserved. <Highly Confidential> 28
Try it out yourself
Try .NET page
https://dotnet.microsoft.com/en-us/platform/try-dotnet
In browser tutorial
https://dotnet.microsoft.com/en-us/learn/dotnet/in-browser-tutorial/1
Try anything
https://try.dot.net/

©2022 Avanade Inc. All Rights Reserved. <Highly Confidential> 29
Summary
2. What?
What is C#?
3. How?
How does it work?
4. Why?
Why use C#?
5. Try it!
Try it for yourself!
6. Summary
More information
and next steps
1. Introduction
Hi there 👋

©2022 Avanade Inc. All Rights Reserved. <Highly Confidential>
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Introduction to C#

2. ©2022 Avanade Inc. All Rights Reserved. <Highly Confidential> 2 Contents 2. What? What is C#? 3. How? How does it work? 4. Why? Why use C#? 5. Try it! Try it for yourself! 6. Summary More information and next steps 1. Introduction Hi there 👋

3. 3 About Me VisualStudioTips.co.uk Start-Coding.com HackathonTips.com GoodBusinessBooks.com Many, many more.. Follow me on Engage! Lee Englestone, Grp Mgr Developer Relations Lead 20+ years Software Developer 4x Microsoft MVP MSc Entrepreneurship Management & Innovation

4. 4 EmTech & Open Innovation OCTO (Office of the CTO) EmTech (Emerging Technology) Open Innovation Developer Relations GSA (Global Solution Area)

9. ©2022 Avanade Inc. All Rights Reserved. <Highly Confidential> 9 Example Application Types Console Application Simple, powerful, basic UI & Input Web Application Typical website Windows Application Think Calculator app Windows Service No UI, runs in the background Azure Cloud Function Simple scalable app in the cloud Web API Web Application Programming Interface – A callable web service Mobile App To run on mobile phones / tables Game A 2D or 3D game

11. 11 A look at C# • Variables & data types • Logic control • Building blocks • Namespaces You can follow along on try.dot.net

24. ©2022 Avanade Inc. All Rights Reserved. <Highly Confidential> 24 Exercise: How many Tuesdays are there in 2023? • Start with a date on 1st of January 2023 • Have an int counter • Loop until 2024 • Each day check if day is a Tuesday • If so, increment a counter

25. ©2022 Avanade Inc. All Rights Reserved. <Highly Confidential> 25 Exercise: What are the dates of all the Tuesdays in 2023? • Same, but add the date to a collection • Iterate through collection and display them

26. ©2022 Avanade Inc. All Rights Reserved. <Highly Confidential> 26 Tooling Visual Studio https://visualstudio.microsoft.com/#vs-section Visual Studio Code https://visualstudio.microsoft.com/#vscode-section LinqPad https://www.linqpad.net/ Rider https://www.jetbrains.com/rider/

28. ©2022 Avanade Inc. All Rights Reserved. <Highly Confidential> 28 Try it out yourself Try .NET page https://dotnet.microsoft.com/en-us/platform/try-dotnet In browser tutorial https://dotnet.microsoft.com/en-us/learn/dotnet/in-browser-tutorial/1 Try anything https://try.dot.net/

29. ©2022 Avanade Inc. All Rights Reserved. <Highly Confidential> 29 Summary 2. What? What is C#? 3. How? How does it work? 4. Why? Why use C#? 5. Try it! Try it for yourself! 6. Summary More information and next steps 1. Introduction Hi there 👋

Editor's Notes

A number of things not covered
Websites Cloud services Games Machine Learning & AI VR & AR Windows Applications Mobile Apps IOT
Stack Overflow survey
Console Application Web Application Windows Application Windows Service Cloud Function Mobile App
string mySentence = "Hello World"; Console.WriteLine(mySentence); Console.WriteLine(mySentence.Length); Console.WriteLine(mySentence.ToUpper()); Console.WriteLine(mySentence.ToLower()); Console.WriteLine(mySentence.Replace(" ", "-")); Console.WriteLine(mySentence + " it's sunny outside");
string mySentence = "Hello World"; Console.WriteLine(mySentence); Console.WriteLine(mySentence.Length); Console.WriteLine(mySentence.ToUpper()); Console.WriteLine(mySentence.ToLower()); Console.WriteLine(mySentence.Replace(" ", "-")); Console.WriteLine(mySentence + " it's sunny outside");
int number1 = 10; int number2 = 25; int number3 = number1 + number2; Console.WriteLine(number3); int whole1 = 13; int whole2 = 2; int whole3 = whole1/whole2; Console.WriteLine(whole3); Console.WriteLine(int.MaxValue); Console.WriteLine(long.MaxValue); nine quintillion two hundred twenty-three quadrillion three hundred seventy-two trillion thirty-six billion eight hundred fifty-four million seven hundred seventy-five thousand eight hundred seven
DateTime date1 = new DateTime(); DateTime birthday = new DateTime(1982, 11, 8, 0, 0,0); DateTime now = DateTime.Now; DateTime thisTimeTomorrow = DateTime.Now.AddDays(1); Console.WriteLine(date1); Console.WriteLine(birthday); Console.WriteLine(now); Console.WriteLine(thisTimeTomorrow); Console.WriteLine(birthday.ToString("dd MMMM yyyy"));
var today = DateTime.Now; Console.WriteLine(today.ToString("ddd dd MM yyyy")); if(today.DayOfWeek == DayOfWeek.Saturday || today.DayOfWeek == DayOfWeek.Sunday) { Console.WriteLine("It's the weekend!"); } else { Console.WriteLine("It's NOT the weekend"); }
string[] names = new string[4]; names[0] = "Marie"; names[1] = "Amber"; names[2] = "Farooq"; names[3] = "Sam"; Console.WriteLine(names.Length); Console.WriteLine(names[1]); List<int> ages = new List<int>(); ages.Add(30); ages.Add(50); ages.Add(32); ages.Add(48); Console.WriteLine(ages.Count()); Console.WriteLine(ages[1]); Console.WriteLine(ages.Sum()); Console.WriteLine(ages.Average());
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