
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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CSharp-Compile-Run-code

.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

# Declaration

In addition to primitive data types, it’s possible to create enumerations in C#. An **enumeration** represents a collection of logically related constants.

For example, we want our method to accept a day of the week as a parameter. We have several options:


 - We could accept a string value (like `"Monday"`)
 - We could accept an integer that represents the day of the week (like `2`)
 - We could use enumerations

In our case, we’ll create an enumeration that holds all possible days of the week, so that the user has to choose a constant we provide.

An enumeration is declared using the `enum` keyword:

```C#
enum DayOfWeek 
{
}
```

The `enum` keyword is followed by the name of the enumeration. Optionally, we can add the type of the enumeration (it must be of whole number type). If the type is omitted, `int` is used by default.

```C#
enum DayOfWeek : short
{
}
```

The body of the enumeration consists of comma-separated constants:

```C#
enum DayOfWeek : short
{
	Monday,
	Tuesday,
	Wednesday,
	Thursday,
	Friday,
	Saturday,
	Sunday
}
```

Each element of the enumeration is assigned an integer value, with the first element valued at `0`, the second element `1`, and so on.

We can specify the elements’ values by indicating the first value:


```C#
enum DayOfWeek : short
{
    Monday = 1,
    Tuesday, // 2
    Wednesday, // 3
    Thursday, // 4
    Friday, // 5
    Saturday, // 6
    Sunday // 7
}
```

We can also specify the values of all constants:

```C#
enum YearCount
{
	Year = 1,
	Decade = 10,
	Century = 100,
	Millenium = 1000
}
```

It’s possible for two constants to have the same underlying value. It’s also possible to assign the value of one constant to another:

```C#
enum MusicGenre
{
	Classic = 1,
	Rock = 2,
	Alternative = 2,
	Old = Classic // Old = 1
}
```

# Usage

Each `enum` defines a new data type. This means that we can declare a variable of this type and use it. Let’s try it out with an example:

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

Enumerations

Declaration