C# 找公倍数（两个数整除、三个数整除）

能同时被两个或者三个整数整除的数值

using System;
using System.Windows.Forms;

namespace A4
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void calculateButton1_Click(object sender, EventArgs e)
        {
            
            outputBox1.Text = "";
            GetNum_1();
            CalculateDivisor_1();
        }
       
        private void calculateButton2_Click(object sender, EventArgs e)
        {
            
            outputBox2.Text = "";

            GetNum_2();
            CalculateDivisor_2();
        }

        private int startNum;
        private int endNum;

        private int firstNum;
        private int secondNum;
        private int thirdNum;

        private void GetNum_1()
        {
            startNum = int.Parse(startNumBox1.Text);
            endNum = int.Parse(endNumBox1.Text);

            firstNum = int.Parse(firstNumBox1.Text);
            secondNum = int.Parse(secondNumBox1.Text);
        }
        
        private void GetNum_2()
        {
            startNum = int.Parse(startNumBox2.Text);
            endNum = int.Parse(endNumBox2.Text);

            firstNum = int.Parse(firstNumBox2.Text);
            secondNum = int.Parse(secondNumBox2.Text);
            thirdNum = int.Parse(thirdNumBox2.Text);
        }
       
        private void CalculateDivisor_1()
        {
            int nextLine = 0;

            outputBox1.Text  = "在"   startNum   "和"   endNum   "之间能被"   firstNum   "和"   secondNum   "整除的数有："   Environment.NewLine;

            for (int i = startNum; i <= endNum; i  )
            {
                if (i % firstNum == 0 && i % secondNum == 0)
                {
                    outputBox1.Text  = (i   "\t");
                    nextLine  ;
                }
              
                if (nextLine == 4) 
                {
                    outputBox1.Text  = Environment.NewLine;
                    nextLine = 0;
                }
            }
        }
     
        private void CalculateDivisor_2()
        {
            int nextLine = 0;

            outputBox2.Text  = "在"   startNum   "和"   endNum   "两个数之间能被"   firstNum   "和"   secondNum   "以及"   thirdNum   "整除的数有："   Environment.NewLine;

            for (int i = startNum; i <= endNum; i  )
            {
                if (i % firstNum == 0 && i % secondNum == 0 && i % thirdNum == 0)
                {
                    outputBox2.Text  = (i   "\t");
                    nextLine  ;
                }
              
                if (nextLine == 4)
                {
                    outputBox2.Text  = Environment.NewLine;
                    nextLine = 0;
                }
            }
        }

        private void startNumBox1_TextChanged(object sender, EventArgs e)
        {

        }

        private void label7_Click(object sender, EventArgs e)
        {

        }

        private void groupBox3_Enter(object sender, EventArgs e)
        {

        }

        private void button1_Click(object sender, EventArgs e)
        {
            this.Close();

        }

        private void endbutton2_Click(object sender, EventArgs e)
        {
            this.Close();
        }
    }
}