C# and .NET Framework Overview

Managed Code

• Managed code is code that runs on top of the Common Language Runtime (CLR)
• The CLR provides services like garbage collection and security
• It ensures that an application can only access the memory it's authorized to access.

Network Communication

• Two different types of computers can transmit information if they both use the TCP/IP protocol
• The TCP/IP model is divided into four layers: Application, Transport, Internet, and Network Access
• The Internet layer of the TCP/IP model includes protocols like IP and ARP

.NET Framework

• The core components of the .NET Framework are the Common Language Runtime(CLR), the Framework Class Library, and ASP.NET Applications
• The CLR is a runtime environment that manages the execution of .NET applications.
• The Framework Class Library is a collection of reusable classes that can be used by .NET applications.
• ASP.NET Applications are web applications that can be developed using the .NET Framework.

C# Programming

• The keyword "int" in C# maps to the .NET type System.Int32
• The keyword "using" in C# states that the program is using the names in the given namespace
• A namespace in C# helps keep sets of names separate from each other, preventing naming conflicts.
• The C# keyword "endregion" marks the end of a #region block
• There are several different ways to declare two-dimensional integer arrays in C#:
  • Int[][] myArray;
  • Int[,] myArray;

Networking

• The Presentation layer in the OSI model uses the data unit called "Data"
• The Network layer in the OSI model performs route selection and information forwarding
• The Transport layer of the TCP/IP model includes protocols like TCP and UDP
• The TCP protocol provides highly reliable packet transport, while UDP provides less reliable, but faster packet transport
• The ARP protocol is used to map IP addresses to physical MAC addresses
• The Ping utility in TCP/IP is used to test network connectivity
• The OSI model organizes communication protocols into 7 layers:
  • Application
  • Presentation
  • Session
  • Transport
  • Network
  • Data Link
  • Physical

Miscellaneous

• The Garbage Collector in .NET is responsible for freeing memory occupied by unreferenced objects, avoiding memory leaks.
• The Main() method is the entry point for a C# program.
• C# exceptions occur at runtime.
• The Common Language Runtime (CLR) provides services to run both "managed" and "unmanaged" applications.
• The "ToString()" method converts a type to a string in C#.

BOPPPS

• BOPPPS is a teaching and learning framework acronym for:
  • Bridge
  • Objectives
  • Pre-assessment
  • Participatory Learning
  • Post-assessment
  • Summary

BOPPPS Element Descriptions

• The bridge element can be used to tell a story, use a current event, or ask a question to capture the learner's attention.
• The objectives element describes the student's learning outcomes in terms of observable behaviors.
• The pre-assessment element helps the teacher to determine the learner's prior knowledge, skills, and attitudes related to the topic.
• The participatory learning element involves activities where learners actively engage with information and concepts.
• The post-assessment element can be used to check for student understanding and evaluate instruction.
• The summary element emphasizes the key points of the lesson, connects the lesson to future lessons, and provides actionable steps for learners to apply their new knowledge.