private void btnSheet8RefTest_Click(object sender, EventArgs e)
{
CalculatorEngine calculator = new CalculatorEngine();
int x = 1, y = 2;
Console.WriteLine(String.Format("(swap Without Ref) Before run method. x = {0}, y = {1}", x, y));
calculator.swapWithoutRef(x, y);
Console.WriteLine(String.Format("(swap Without Ref) After run method. x = {0}, y = {1}", x, y));
x = 1;
y = 2;
Console.WriteLine(String.Format("(swap With Ref) Before run method. x = {0}, y = {1}", x, y));
calculator.swapWithRef(ref x, ref y);
Console.WriteLine(String.Format("(swap With Ref) After run method. x = {0}, y = {1}", x, y));
}