public T Pop()
{
if (first != null)
{
T temp = first.value;
first = first.nextElement;
return(temp);
}
else
{
throw new NullReferenceException();
}
}
public void Push(T element)
{
if (first != null)
{
StackElement <T> temp = new StackElement <T>()
{
value = element, nextElement = first
};
first = temp;
}
else
{
first = new StackElement <T>()
{
value = element,
nextElement = null
};
}
}