Quadratic Equation

/*
 * Write a program that reads the coefficients a, b and c of a quadratic equation ax2+bx+c=0 and solves it (prints its real roots).
*/

using System;

class QuadraticEquation
{
    static void Main()
    {
        double coefficientA, coefficientB, coefficientC, discriminantD;

        string invalidInput = "Invalid input! Please enter value between " + double.MinValue + " and " + double.MaxValue + "!" + Environment.NewLine; ;
        Console.WriteLine("ax^2 + bx + c = 0, a != 0");
        Console.WriteLine("Enter value of coefficient a: a = ");
        while (!(double.TryParse(Console.ReadLine(), out coefficientA) && coefficientA >= double.MinValue && coefficientA <= double.MaxValue && coefficientA != 0))
        {
            Console.WriteLine(invalidInput + "Coefficient \"a\" must be different from 0!" + Environment.NewLine);
            Console.WriteLine("Enter value of coefficient a: a = ");
        }

        Console.WriteLine("Enter value of coefficient b: b = ");
        while (!(double.TryParse(Console.ReadLine(), out coefficientB) && coefficientB >= double.MinValue && coefficientB <= double.MaxValue))
        {
            Console.WriteLine(invalidInput);
            Console.WriteLine("Enter value of coefficient b: b = ");
        }

        Console.WriteLine("Enter value of coefficient c: c = ");
        while (!(double.TryParse(Console.ReadLine(), out coefficientC) && coefficientC >= double.MinValue && coefficientC <= double.MaxValue))
        {
            Console.WriteLine(invalidInput);
            Console.WriteLine("Enter value of coefficient c: c = ");
        }

        discriminantD = (Math.Pow(coefficientB, 2)) - (4 * coefficientA * coefficientC);

        if (discriminantD < 0)
        {
            Console.WriteLine("The quadratic equation {0}x^2 + {1}x + {2} = 0 has no real roots because discriminant D = {3}" + Environment.NewLine, coefficientA, coefficientB, coefficientC, discriminantD);
        }
        if (discriminantD > 0)
        {
            double DRoot2 = Math.Sqrt(discriminantD);
            double resultX1 = (((-1) * coefficientB) + DRoot2) / (2 * coefficientA);
            double resultX2 = (((-1) * coefficientB) - DRoot2) / (2 * coefficientA);

            Console.WriteLine("The quadratic equation {0}x^2 + {1}x + {2} = 0 has two real roots: x1 = {3} and x2 = {4} and discriminant D = {5} !" + Environment.NewLine, coefficientA, coefficientB, coefficientC, resultX1, resultX2, discriminantD);
        }
        if (discriminantD == 0)
        {
            double resultX1 = (((-1) * coefficientB)) / (2 * coefficientA);
            Console.WriteLine("The quadratic equation {0}x^2 + {1}x + {2} = 0 has one real root: x1 = {3} and discriminant D = {4} !" + Environment.NewLine, coefficientA, coefficientB, coefficientC, resultX1, discriminantD);
        }

        Main();
    }
}