BEPUutilities.Quaternion.LengthSquared C# (CSharp) Method

        public float LengthSquared()
        {
            return X * X + Y * Y + Z * Z + W * W;
        }

 public static void Validate(this Quaternion q)
 {
     if (IsInvalid(q.LengthSquared()))
     {
         throw new NotFiniteNumberException("Invalid value.");
     }
 }