Function or Method in C#

DevSniper
Published : 18 March 2024

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A method or Function is a block of code that perform a task.

Signature :-

<Access Modifier> <Return Type> <Method Name>(Parameter List) 
{
   // Method Body
}

Access Modifier :- it is used to define accessibility of the method. access modifier in c# are public , internal, protected and private
Return Type :- it is used to define data type of value that method will return. if method is not returning any value it will be void.
Method Name :- it is a unique name of the method that user define based on task/action that the method perform. and this method name is used to call this method. it is case sensitive.
Parameter List :- it is used to pass or receive data from a method. it is optional i.e. we can define a method without a parameter.
Method Body :- it is a block of code that perform action or task.
it is used to perform specific action or task.
it is used to write reusable code. define a method once and use that method in different place.
A method can be called as many times as you want.
A method or function without parameter is also known as non-parameterized method or function.
it makes our code well structured.
it enhance readability of the code.

C# Method : no return type and no parameter

 using System;

class FunClass
{
    public void fun()
    {
        Console.WriteLine("no return type and non parameterized method ");
    }
}
class Program
{
    static void Main()
    {
        var obj= new FunClass();
        obj.fun();
    }
}

no return type and non parameterized method

C# method : return type and no parameter

using System;

class FunClass
{
    public int fun()
    {
        Console.WriteLine("return type and non parameterized method ");
        return 10;
    }
}
class Program
{
    static void Main()
    {
        var obj = new FunClass();
        var v = obj.fun();
        Console.WriteLine("return value : "+v);
    }
}

return type and non parameterized method 
return value : 10

C# method : no return type and parameter

using System;

class FunClass
{
    public void fun(string name)
    {
        Console.WriteLine("no return type and parameterized method");
        Console.WriteLine("parameter name value : "+name);
    }
}
class Program
{
    static void Main()
    {
        var obj = new FunClass();
        obj.fun("C#_PARAM");
    }
}

no return type and parameterized method
parameter name value : C#_PARAM

C# method : return type and parameter

using System;

class FunClass
{
    public int fun(string name)
    {
        Console.WriteLine("return type and parameterized method");
        Console.WriteLine("parameter name value : "+name);
        return 10;
    }
}
class Program
{
    static void Main()
    {
        var obj = new FunClass();
        var v = obj.fun("C#_PARAM");
        Console.WriteLine("return value : "+v);
    }
}

return type and parameterized method
parameter name value : C#_PARAM
return value : 10