C# Program Structure - c# - c# tutorial - c# net

C# Program Structure

c# windows applications - program structure :

c# program hierarchy :

Comments in c# :

• Make the code more readable
• Three types of commenting syntax
• 1. Inline comments
• 2. Multiline comments
• 3. XML documentation comments

Inline Comments :

• Indicated by two forward slashes (//)
• Considered a one-line comment
• Everything to the right of the slashes ignored by the compiler
• Carriage return (Enter) ends the comment
• Example - > // This is wikitechy first program written by venkat.

Multiline Comment :

• Forward slash followed by an asterisk (/*) marks the beginning
• Opposite pattern (*/) marks the end
• Also called block comments
• Example - > /* This is the beginning of a block multiline comment. It can go on for several lines or just be on a single line. No additional symbols are needed after the beginning two characters. Notice there is no space placed between the two characters. To end the comment, use the following symbols. */

XML Documentation Comments :

• Extensible Markup Language (XML)
• Markup language that provides a format for describing data using tags Similar to HTML tags
• Three forward slashes (///) mark beginning of comment
• Advanced documentation technique used for XML-style comments
• Compiler generates XML documentation from them

c# namespace :

• Namespaces provide scope for the names defined within the group
• Groups semantically related types under a single umbrella
• System:System: most important and frequently used namespace
• most important and frequently used namespace
• Can define your own namespace
• Each namespace enclosed in curly braces: { }

c# Main( ) function :

• "Entry point" for all applications
• Where the program begins execution
• Execution ends after last statement in Main( )
• Can be placed anywhere inside the class definition
• Applications must have one Main( ) method
• Begins with uppercase character
• static void Main( ) Begins with the keyword static – a static member is a member of a class that isn't associated with an instance of a class. Instead, the member belongs to the class itself. 
• Second keyword → return type
• void signifies no value returned
• Name of the method
• Main is the name of Main( ) method
• Parentheses "( )" used for arguments
• No arguments for Main( ) – empty parentheses 

c# Body of a Method :

• Enclosed in curly braces 
• Example Main( ) method body  
• line 7 static void Main( ) 
• line 8 {  
• line 9 Console.WriteLine("Hello World!");  
• line 10 }  
• Includes program statements 
• Calls to other method 
• Here Main( ) calling WriteLine( ) method 

c# Escape Sequence :

c# - Types of errors :

• Syntax errors
• Typing error
• Misspelled name
• Forget to end a statement with a semicolon
• Run-time errors
• Failing to fully understand the problem
• More difficult to detect

c# naming convention :

• Pascal case
  • First letter of each word capitalized
  • Class, metahod, namespace, and properties identifiers

• Camel case
• Hungarian notation
• First letter of identifier lowercase; first letter of subsequent concatenated words capitalized
• Variables and objects

• Every character is uppercase
• Constant literals and for identifiers that consist of two or fewer letters

c# invalid naming convention - c# invalid identifiers :

c# Assemblies :

Code contained in files called "assemblies"

• code and metadata
• It can be .exe or .dll
• Executable needs a class with a "Main" method: public static void Main(string[] args)
• Various types of assemblies
  • local : local assembly, not accessible by others
  • shared : well-known location, can be GAC - Gobal Assembly Cache
  • strong names : use crypto for signatures then can add some versioning and trust

The following programming example we will show how to create and use structure in C# programming.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace wikitechy
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Welcome to wikitechy world - C#..!");
            Console.WriteLine("Press any key to exit.");
            Console.ReadKey();
        }
    }
}