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C# - Private Constructor in C# with Example

Sep 27, 2013

Here I will explain what is private constructor in c# with example. Private constructor in c# is used to restrict the class from being instantiated when it contains every member as static.


Constructor is a special method of a class which will invoke automatically whenever instance or object of class is created. Constructors are responsible for object initialization and memory allocation of its class. If we create any class without constructor, the compiler will automatically create one default constructor for that class. There is always at least one constructor in every class. If you want to know more about constructors check this article constructors in c#.

Private Constructor

Private constructor is a special instance constructor used in a class that contains static member only. If a class has one or more private constructor and no public constructor then other classes is not allowed to create instance of this class this mean we can neither create the object of the class nor it can be inherit by other class. The main purpose of creating private constructor is used to restrict the class from being instantiated when it contains every member as static.

using System;
namespace ConsoleApplication3
public class Sample
public string param1, param2;
public Sample(string a,string b)
param1 = a;
param2 = b;
private Sample()  // Private Constructor Declaration
Console.WriteLine("Private Constructor with no prameters");
class Program
static void Main(string[] args)
// Here we don't have chance to create instace for private constructor
Sample obj = new Sample("Welcome","to Aspdotnet-Suresh");
Console.WriteLine(obj.param1 +" " + obj.param2);

Welcome to Aspdotnet-Suresh
In above method we can create object of class with parameters will work fine. If create object of class without parameters it will not allow us create.

// it will works fine
Sample obj = new Sample("Welcome","to Aspdotnet-Suresh");
// it will not work because of inaccessability
Sample obj=new Sample();
Important points of private constructor

-      One use of private construct is when we have only static member.
-      Once we provide a constructor that is either private or public or any, the compiler will not allow us to add public constructor without parameters to the class.
-      If we want to create object of class even if we have private constructors then we need to have public constructor along with private constructor

I hope it helps to know about private constructor. If you want to know more about constructors check this article constructors in c#.

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Anonymous said...

Nice Article...

Anonymous said...


Unknown said...


Unknown said...

If a constructor is private, it will never be called. then what is the use of it?

Unknown said...

then how can access the private constructor

Shaminder said...

Not a good explanation, guys search for Singleton pattern, Factory pattern, Pseudo sealed , Base constructor for more explaination.

Anonymous said...

the main use of private constructor is that when we use utility or resource file in our project that time just call that class without instanciating or inherting to save the memory reserve and faster access.

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