Without private constructor we can access static member from one to other class?

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OOP

C#6.0

use of private constructor : it cant able to create instance, it cant be inherit, it contain only static data members

without private constructor also i can able to access class with its static declaration and static data member when assign value like the below example

class Test
{        
    public static int x = 12;
    public static int method()
    {
        return 13;
    }
}
class Program
{
    int resut1 = Test.x;
    int resut2 = Test.method();
    static void Main(string[] args)
    {
    }
}

so i have doubts as below why should go to private constructor what is the use of private constructor block is we cant do anything inside of private constructor block when it execute please explain clearly

thanks in advance

What I have tried:

i tried without private constructor

in private constructor also not access static data members when call inside of non static methods or inside of class block.

the same as one class (class1 ) have static data members and another class (class2)

class1 static data member cant able to call in class2