How to convert a positive number to negative number and negative to positive in C#?

To Convert positive number to negative number using C#

int myNegInt = System.Math.Abs(myNumber) * (-1);

or Simply

int NegNumber= -System.Math.Abs(myNumber)

To Convert negative number to positive number in C#

var NegativeNumber= -1010;
var PositiveNumber=Math.Abs(NegativeNumber); //output 1010

That's it.

There is a simple way to convert positive to negative in C#

var positive = 5;
var negative = -positive;

and to convert negative to positive in C#

var getPositiveValue = (Math.Abs(-5));

Thanks.