C#求一元二次方程的根

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using System;using System.Collections.Generic;using System.ComponentModel;using System.Data;using System.Drawing;using System.Linq;using System.Text;using System.Threading.Tasks;using System.Windows.Forms;namespace 求一元二次方程的根{    public partial class Form1 : Form    {        public Form1()        {            InitializeComponent();        }        private double[] Root2(double a, double b, double c)        {            double []Roots=new double[2];            double Delt=b * b - 4 * a * c;            if (Delt >= 0)            {                Roots[0] = (-b + Math.Sqrt(Delt)) / 2 * a;                Roots[1] = (-b - Math.Sqrt(Delt)) / 2 * a;                return Roots;            }            else            {                Roots = null;                return Roots;            }        }        private void button2_Click(object sender, EventArgs e)        {            Application.Exit();        }        private void button1_Click(object sender, EventArgs e)        {            if (Root2(double.Parse(textBox1.Text), double.Parse(textBox2.Text), double.Parse(textBox3.Text)) == null)            {                MessageBox.Show("無實根啊！","錯誤提示",MessageBoxButtons.OK,MessageBoxIcon.Warning); return;            }            textBox4.Text = Root2(double.Parse(textBox1.Text), double.Parse(textBox2.Text), double.Parse(textBox3.Text))[0].ToString();            textBox5.Text = Root2(double.Parse(textBox1.Text), double.Parse(textBox2.Text), double.Parse(textBox3.Text))[1].ToString();        }    }}

C#求一元二次方程的根