C# (pronounced "See Sharp") is a modern, object-oriented, and type-safe programming language. Developed by Microsoft that runs on the .NET Framework.

C# is one of the most popular programming languages and can be used for a variety of things, including mobile applications, game development, and enterprise software. Knowing C# opens a great deal of doors for you as a developer.

C# has roots from the C family, and the language is close to other popular languages like C++ and Java.
The first version was released in year 2002. The latest version, C# 8, was released in September 2019.

C# Syntax:

Above code will display "Hello World" on the screen.
Line 1: using System means that we can use classes from the System namespace.
Line 2: A blank line. C# ignores white space. However, multiple lines makes the code more readable.
Line 3: namespace is used to organize your code, and it is a container for classes and other namespaces.
Line 4: The curly braces {} marks the beginning and the end of a block of code.
Line 5: class is a container for data and methods, which brings functionality to your program. Every line of code that runs in C# must be inside a class. In our example, we named the class Program.
Line 7: Another thing that always appear in a C# program, is the Main method. Any code inside its curly brackets {} will be executed. You don't have to understand the keywords before and after Main. You will get to know them later.
Line 9: Console is a class of the System namespace, which has a WriteLine() method that is used to output/print text. In our example it will output "Hello World!".
If you omit the using System line, you would have to write System.Console.WriteLine() to print/output text.
Note: Every C# statement ends with a semicolon ;.
Note: C# is case-sensitive: "MyClass" and "myclass" has different meaning.
Note: Unlike Java, the name of the C# file does not have to match the class name, but they often do (for better organization). When saving the file, save it using a proper name and add ".cs" to the end of the filename.