Shitty way of testing if a number is even

IsEven.cs

public bool IsEven(int num)
{
  int up = num;
  int down = num;
  try
  {
    while(up != 0)
    {
      up = up + 2;
    }
    return true;
  }
  catch(OverflowException)
  {
  }

  try
  {
    while(down != 0)
    {
      down = down - 2;
    }
    return true;
  }
  catch(OverflowException)
  {
  }
  return false;
}