C# Identifiers

In C#, identifiers are the user-defined names given to program elements such as variables, methods, classes, and labels. They are used to identify these elements in a program. Example: 

// Declaring a variable
int x = 10;

// Defining a class
class GFG { }

// Defining a method
void Main() { }

In the above code block- 'x', "GFG" and "Main" are identifiers representing a variable, class, and method respectively and are user-defined names used to uniquely identify program elements in C#.

Rules for Defining Identifiers

There are certain valid rules for defining a valid C# identifier. These rules should be followed, otherwise, we will get a compile-time error.  

Types of Identifiers

Identifiers in C# can represent different program elements:

• Class Identifiers: Names of classes (e.g., GFG)
• Method Identifiers: Names of methods (e.g., Main)
• Variable Identifiers: Names of variables (e.g., x)
• Object Identifiers: Names of objects created from classes

using System;

class Geeks
{
    static public void Main()
    {
        int a = 10;
        int b = 39;
        int c;

        c = a + b;

        Console.WriteLine("The sum of two numbers is: {0}", c);
    }
}

The sum of two numbers is: 49

In the above example:

• Keywords: using, public, static, void, int.
• Identifiers: Geeks, Main , a, b, c.

Naming Conventions for Identifiers

Use meaningful names (e.g., totalMarks instead of tm). Use the following naming conventions:

• PascalCase: for classes and methods (StudentData)
• camelCase: for variables (studentAge)

Avoid using reserved keywords as identifiers.