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+---
+authors:
+  - "HueByte#0001"
+created_at: 2022/10/31
+title: Basic information about .NET and C#
+---
+
+## What is C#? 
+It's a modern, object-oriented, component-oriented, type-safe language with the support of functional programming techniques.
+
+It's multi-paradigm: *structured, imperative, object-oriented, event-driven, task-driven, functional, generic, reflective, concurrent*
+
+C# has many features to develop robust and durable applications.
+
+- Garbe collections take care of automatically reclaim occupied memory by unreachable unused objects. 
+
+- Nullable types guard against variables that don't refer to allocated objects.
+
+- Exception handling provides a structured and extensible approach to error detection and recovery.
+
+- Lambda expressions support functional programming techniques,
+
+- Language Integrated Query (LINQ) syntax creates a common pattern for working with data from any source.
+
+- Language support for asynchronous operation provides a syntax for building distributed systems.
+
+- C# has a `unified type system`. All types inherit from a single root `object` type. Values of any type can be stored, transported, and operated upon in a consistent manner.
+
+- C# supports both `value types` and `reference types`. C# allows dynamic allocation of objects and in-line storage of lightweight structures. 
+
+- C# supports generic methods and types, which provide increased type safety and performance.
+
+- C# provides iterators that enable implementers of collection classes to define custom behaviors for client code. 
+
+## .NET architecture
+C# programs run on .NET, a virtual execution system called the common language runtime (`CLR`).
+
+ The `CLR` is implementation by Microsoft of the common language infrastructure (`CLI`), an international standard. The CLI is the basis for creating execution and development environments in which languages and libraries work together seamlessly.
+
+Source code written in C# is compiled into an `intermediate language (IL)` which is `byte code` that conforms to the `CLI` specification.
+The `IL` code and resources such as bitmaps and string, are stored in an assembly, typically with an extension of `.dll`. An assembly contains a manifest that provides information about the assembly's types, version, and culture.
+
+When the C# program is executed, the assembly is loaded into the `CLR`. The CLR performs a `Just-In-Time` (`JIT`) compilation to convert the `IL` code to native machine instruction. 
+
+The CLR provides other services related to automatic garbage collection, exception handling, and resource management. Code that's executed by the CLR is sometimes referred to as "managed code." 
+
+"Unmanaged code" is compiled into a native machine language that targets a specific platform.
+
+Language interoperability is a key feature of .NET. IL code produced by the C# compiler conforms to the `Common Type Specification` (`CTS`). IL code generated from C# can interact with code that was generated from the .NET version of F#, VB, and C++.
+
+There are more than 20 other CTS-compliant languages. A single assembly may contain multiple modules written in indifferent .NET languages. The types can reference each other as if they were written in the same language. 
+The types can reference each other as if they were written in the same language.
+
+In addition to the run time services, .NET also includes extensive libraries like `Base Class Library` (`BCL`). These libraries support many different workloads. They're organized into namespaces that provide a wide variety of useful functionality. The libraries include everything from file input and output to string manipulation to XML parsing, to web application frameworks to Windows Forms controls. The typical C# app uses the .NET class library extensively to handle common "plumbing" chores. 
+
+## Hello World
+```cs
+using System;
+
+class Hello
+{
+    static void Main()
+    {
+        Console.WriteLine("Hello, World");
+    }
+}
+```
+
+The program starts with a `using` **directive** that references the `System` namespace. Namespaces contain types and other namespaces and provide hierarchical means of organization.
+
+The `Hello` class has a single member, the method `Main`. `Main` method is declared with the `static` **modifier**. Static methods operate without reference to a particular object. By convention, a static method named `Main` serves as the entry point of a C# program
+
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