What is the role of a constructor when creating an object and why is it needed?

A constructor in C# is a special method of a class that is called when a new object is created. Its main role is to initialize the object, that is, to set the initial values of fields and perform necessary setup.

A constructor is needed to ensure that the object will be created in a correct state. If a constructor is not explicitly defined, the compiler will create a default parameterless constructor.

Example of a constructor:

public class Person
{
    public string Name { get; }
    public int Age { get; }

    public Person(string name, int age)
    {
        Name = name;
        Age = age;
    }
}

// Creating an object
var person = new Person("Ivan", 30);