Every member of a class(variable or method) it it is non--static can be accessed under the Main method only by using object of class. A variable of a class is a copy of the class which is not initialized.
obj ----> null
An object of a class is a copy of a class which is initialized using new keyword and the memory is allocated for an object of class.
obj --->100=x
using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace CSharpConsole { class First { int x = 100; static void Main() { First obj = new First(); Console.WriteLine(obj.x); //obj is a object or instance Console.ReadLine(); } } } // It will print the value of x=100
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