Static - Key things about using 'static'

In this post I'll pin point you the important facts that you should be aware of when using static methods, variable & classes etc.

• If a there is a static field declared in a non static context (class) it can be accessed without creating an object (object of the class).

    class Sales

    {

       public static double salesTaxPercentage = 20;

    }

    Sales.salesTaxPercentage  = 35; // can access like this

• You cannot access static fields from an instance of the type it belongs to.

    Sales _sales = new Sales();

    _sales.salesTaxPercentage = 35;  // Compile error.

• If you declare a Class as static it cannot contain non static members such as fields, methods, and constructors.

static class Sales { public static void Sales1() {...} // Ok

public void Sales2() {...} // Compile Error

}

• A non static context cannot be accessed within a static context.

 public int a = 0;
static class Sales {

a = 10; // Compile Error

}