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Co-authored-by: James Montemagno <james.montemagno@gmail.com>
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# C# Crash Course
In this C# Crash Course, we'll go over the basics of C# so that you'll be ready to build out exciting web apps in emails 3, 4, and 5! We'll start by going through the key attributes of C#, syntax basics, and introduce you to OOP. In each section, we'll link you to some quick in-browser C# challenges so you can apply these concepts.
In this C# Crash Course, we'll go over the basics of C# so that you'll be ready to build out exciting web apps! We'll start by going through the key attributes of C#, syntax basics, and introduce you to OOP. In each section, we'll link you to some quick in-browser C# challenges so you can apply these concepts.
## Topics you'll learn
* Language attributes
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**Keywords** are predefined, reserved identifiers that have special meanings to the compiler.
## Accessing methods
The Dot in *Console.WriteLine* allows us to access methods and properties. In this example, **Console** is a type that represents the console window. **WriteLine** is a method of the Console type that prints a line of text to that text console.
The `. (DOT)` in *Console.WriteLine* allows us to access methods and properties. In this example, **Console** is a type that represents the console window. **WriteLine** is a method of the Console type that prints a line of text to that text console.
## Parameters
In this example, we use parentheses pass a string as a parameter to *Console.WriteLine*.
## Variables
In C#, **variables** allow you to temporarily store a value in memory. In C#, you must declare a vaiable before using it.
In C#, **variables** allow you to temporarily store a value in memory. In C#, you must declare a variable before using it.
```csharp
var cSharp = "really cool";
```
In this example, we created a string called *cSharp*. You can use the var keyword to declare local variables without explicitly giving them a type.
In this example, we created a string called `cSharp`. You can use the var keyword to declare local variables without explicitly giving them a type.
Variable names can contain alphanumeric characters and underscores, but no special characters. They also cannot be keywords.