coding in c#

Main Formatting Rules
If we want our code to be correctly formatted, we must follow several important rules regarding indentation:
- Methods are indented inside the definition of the class (move to the right by one or more [Tab] characters);
- Method contents are indented inside the definition of the method;
- The opening curly bracket { must be on its own line and placed exactly under the method or class it refers to;
- The closing curly bracket } must be on its own line, placed exactly vertically under the respective opening bracket (with the same indentation);
- All class names must start with a capital letter;
- Variable names must begin with a lower-case letter;
- Method names must start with a capital letter;
Code indentation follows a very simple rule: when some piece of code is logically inside another piece of code, it is indented (moved) on the right with a single [Tab]. For example if a method is defined inside a class, it is indented (moved to the right). In the same way if a method body is inside a method, it is indented. To simplify this, we can assume that when we have the character “{“, all the code after it until its closing “}” should be indented on the right.
File Names Correspond to Class Names
Every C# program consists of one or several class definitions. It is accepted that each class is defined in a separate file with a name corresponding to the class name and a .cs extension. When these requirements are not met, the program will still work but navigating the code
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will be difficult. In our example, the class is named HelloCSharp, and as a result we must save its source code in a file called HelloCSharp.cs.
The C# Language and the .NET Platform
The first version of C# was developed by Microsoft between 1999 and 2002 and was officially released to the public in 2002 as a part of the .NET platform. The .NET platform aims to make software development for Windows easier by providing a new quality approach to programming, based on the concepts of the "virtual machine" and "managed code". At that time the Java language and platform reaped an enormous success in all fields of software development; C# and .NET were Microsoft’s natural response to the Java technology.
The C# Language
C# is a modern, general-purpose, object-oriented, high-level prog-ramming language. Its syntax is similar to that of C and C++ but many features of those languages are not supported in C# in order to simplify the language, which makes programming easier.
The C# programs consist of one or several files with a .cs extension, which contain definitions of classes and other types. These files are compiled by the C# compiler (csc) to executable code and as a result assemblies are created, which are files with the same name but with a different extension (.exe or .dll). For example, if we compile HelloCSharp.cs, we will get a file with the name HelloCSharp.exe (some additional files will be created as well, but we will not discuss them at the moment).
We can run the compiled code like any other program on our computer (by double clicking it). If we try to execute the compiled C# code (for example HelloCSharp.exe) on a computer that does not have the .NET Framework, we will receive an error message.