Создание собственной библиотеки классов

public class Complex : IEquatable<Complex>
    {
        public double Imaginary { get; private set; }
        public double Real { get; private set; }
 
        public Complex()
        {
            Imaginary = 0;
            Real = 0;
        }
        public Complex(double real, double imaginary)
        {
            Imaginary = imaginary;
            Real = real;
        }
 
        //Operators
        #region Operators
        public static IEquatable<Complex> operator +(Complex c1, Complex c2)
        {
            return new Complex(c1.Real+c2.Real,c1.Imaginary+c2.Imaginary);
        }
        public static IEquatable<Complex> operator -(Complex c1, Complex c2)
        {
            return new Complex(c1.Real - c2.Real, c1.Imaginary - c2.Imaginary);
        }
        public static Complex operator ++(Complex c1)
        {
            return new Complex(c1.Real++, c1.Imaginary++);
        }
        public static Complex operator --(Complex c1)
        {
            return new Complex(c1.Real--, c1.Imaginary--);
        }
        public static IEquatable<Complex> operator !(Complex c1)
        {
            return new Complex(c1.Real, -c1.Imaginary);
        }
        public static IEquatable<Complex> operator *(Complex c1,Complex c2)
        {
            return new Complex(c1.Real*c2.Real-c1.Imaginary*c2.Imaginary, c1.Real*c2.Imaginary+c1.Imaginary*c2.Real);
        }
        public static IEquatable<Complex> operator /(Complex c1, Complex c2)
        {
            return new Complex((c1.Real * c2.Real + c1.Imaginary * c2.Imaginary) / (c2.Real * c2.Real + c2.Imaginary * c2.Imaginary), (c1.Imaginary * c2.Real - c1.Real * c2.Imaginary) / (c2.Real * c2.Real + c2.Imaginary * c2.Imaginary));
        }
        public static bool operator ==(Complex c1, Complex c2)
        {
            return (c1.Real==c2.Real)&&(c1.Imaginary==c2.Imaginary);
        }
        public static bool operator !=(Complex c1, Complex c2)
        {
            return (c1.Real != c2.Real) || (c1.Imaginary != c2.Imaginary);
        }
        public static bool operator <(Complex c1, Complex c2)
        {
            return (c1.Real < c2.Real) && (c1.Imaginary < c2.Imaginary);
        }
        public static bool operator >(Complex c1, Complex c2)
        {
            return (c1.Real > c2.Real) && (c1.Imaginary > c2.Imaginary);
        }
        public static bool operator <=(Complex c1, Complex c2)
        {
            return (c1.Real <= c2.Real) && (c1.Imaginary <= c2.Imaginary);
        }
        public static bool operator >=(Complex c1, Complex c2)
        {
            return (c1.Real >= c2.Real) && (c1.Imaginary >= c2.Imaginary);
        }
        #endregion
 
        //Overrides and Equals implementation
        #region
        public bool Equals(Complex other)
        {
            if (ReferenceEquals(null, other)) return false;
            if (ReferenceEquals(this, other)) return true;
            return other.Imaginary.Equals(Imaginary) && other.Real.Equals(Real);
        }
        public override bool Equals(object obj)
        {
            if (ReferenceEquals(null, obj)) return false;
            if (ReferenceEquals(this, obj)) return true;
            return obj.GetType() == typeof (Complex) && Equals((Complex) obj);
        }
        public override int GetHashCode()
        {
            unchecked
            {
                return (Imaginary.GetHashCode()*397) ^ Real.GetHashCode();
            }
        }
        #endregion
    }