
Delve into .NET development with C#, covering programming fundamentals, object-oriented principles, exception handling, and multithreading. Gain hands-on experience to build cross-platform applications effectively.

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.NET is Microsoft’s free and open source framework for developing native software applications on Linux, macOS, and Windows. The power of cross-platform development allows developers to design, code, and run programs on a wide array of platforms.

This course is an introduction to developing .NET applications using C#. You’ll start start with a comprehensive review of C# and computer programming fundamentals: data types, conditionals, loops, methods, and more. You’ll then review the basics of object-oriented programming before diving into methods, exception handling, delegation, and events. With this foundation, you’ll continue building interfaces, collections, database operations, and multithreading. You’ll wrap up with process improvements using dynamic binding, garbage collection, and unmanaged resources.

By the end of this course, you’ll have hands-on experience with C# and .NET, and be ready to build applications using object-oriented programming principles on almost any platform.

Mastering C# and .NET

# Introduction

The `ArrayList` class solved the issues we had with arrays, but it also introduced new issues. .NET developers addressed the concerns with a set of generic collection classes. This lesson focuses on the `List<T>` class. Instead of using an `object[]` type array,  like `ArrayList` does, generic collections use parameter types. In the case of `List<T>`, the internal array is of type `T[]`. Generic collections introduce strong typing. The `List<int>` class can only store `int` items, and `List<string>` can only store `string` objects. There won’t be issues like the ones we had with `ArrayList`.

# Syntax

The `List<T>` class is instantiated just like any other class:

```C#
var listOfIntegers = new List<int>();
```

Here, we create a list that can only store integers inside. The internal array is of type `int[]`. 

Lists we create are initially empty. Empty means that the size of the internal array is zero. When we add the first item, though, a new array of size four is created.

```C#
listOfIntegers.Add(17);
```

Each time this array fills, it doubles in size, and values from the previous array are copied over.

This information could be useful for optimization purposes. If we’re sure that we’ll store more than a specific number of items, then we can set the initial size of the list:

```C#
var listOfIntegers = new List<int>(500);
```

The initial size of this list is`500`. The `List<int>` class initializes an `int[]` array of size `500`.

Here are some of the most common operations we can perform with `List<T>`:

- We can add an item to the end of the list using the `Add()` method.
 
- We can add items from another collection to our list using the `AddRange()` method.

- We can insert an item to a specific position using the `Insert()` method.

- We can remove an item using the `Remove()` method 

- We can delete an item at a specific position using the `RemoveAt()` method.

# Examples

Let’s explore some examples below to clarify these methods.

## Add and remove items




Learn about the generic counterpart of the ArrayList class.

Getting Started

C# Programming Basics

Classes and OOP

Classes and OOP II

Exception Handling

First Assessment

Delegates and Events

Interfaces

Additional Features

Collections

LINQ

Working with Strings

Working with Dates and Time

Multithreading and Asynchronous Programming

Reflection

Dynamic Binding

Garbage Collection and Unmanaged Resources

Final Assessment

Next Steps

Appendix

Generic List

Introduction