แนะนำการ convert ค่าให้หน่อยครับ convert จาก string เป็น int double รายละเอียดด้านในครับ c#

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.IO;
using System.Collections;

namespace WindowsFormsApplication5
{
    struct Arcs
    {
        public int q;
        public int r;
        public double s;
        public double t;
        public Arcs(int q1, int r1, double s1, double t1)
        {
            q = q1;
            r = r1;
            s = s1;
            t = t1;
           // ArrayList myData = new ArrayList();
           // string[] word = Text.Split(' ');

        }
    }
        public partial class Form1 : Form
        {
            ArrayList myData;

            public Form1()
            {
                InitializeComponent();
                myData = new ArrayList();
            }

            private void button1_Click(object sender, EventArgs e)
            {
                OpenFileDialog ofd = new OpenFileDialog();
                ofd.ShowDialog();
                string fname = ofd.FileName;
                String line;
                try
                {
                    StreamReader sr = new StreamReader(fname);
                    line = sr.ReadLine();
                    while (line != null)
                    {
                        string[] words = line.Split(' ','\b'); 
                        
                        //Arcs a = new Arcs(1, 2, 10.2, 5.3); //words[1], words[2], words[3]);
                        //Arcs a = new Arcs(int.Parse(words[0]), int.Parse(words[1]), double.Parse(words[2]), double.Parse(words[3])); 
                        //Arcs a = new Arcs();
                        //a.q = Convert.ToInt32(words[0]);
                        //a.r = Convert.ToInt32(words[1]);
                        Arcs a = new Arcs(Convert.ToInt32(words[0]), Convert.ToInt16(words[1]), 10.2, 5.3); // ปัญหาที่ส่วนนี้แหละครับ ด้านบนคือส่วนที่ผมลองคอมไพล์ดูแต่ก้อยังไม่ได้
                        int aa = Convert.ToInt32(words[0]);

                        // myData.Add(a);
                        textBox1.Text += line + "\r\n";
                        //textBox1.Text += words[2] + "\r\n";
                        line = sr.ReadLine();
                    }
                    sr.Close();

                }

                catch (Exception)
                {
                }
                finally
                {
                }
            }
        }

    }