Form1.cs

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;
using System.IO;
using WinFormStringCnvClass;

namespace GetWinform
{

    public partial class Form1 : Form
    {
        string thisExeDirPath;
        public Form1()
        {
            InitializeComponent();
            thisExeDirPath = Path.GetDirectoryName(Application.ExecutablePath);

        }

        private void Form1_Load(object sender, EventArgs e)
        {
            OpenFileDialog ofd = new OpenFileDialog();
            ofd.Filter = "TEXT|*.txt";
            if (false && ofd.ShowDialog() == DialogResult.OK){
            WinFormStringCnv.setControlFromString(this, File.ReadAllText(ofd.FileName));
            }else{
            string paramFilename = Path.Combine(thisExeDirPath, "_param.txt");
            if (File.Exists(paramFilename))
            {
                WinFormStringCnv.setControlFromString(this, File.ReadAllText(paramFilename));
            }
            }

        }

        private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {
            string FormContents = WinFormStringCnv.ToString(this);

            SaveFileDialog sfd = new SaveFileDialog();
            sfd.Filter = "TEXT|*.txt";

            if (false && sfd.ShowDialog() == DialogResult.OK) {

            File.WriteAllText(sfd.FileName, FormContents);
            }else{
            string paramFilename = Path.Combine(thisExeDirPath, "_param.txt");
            File.WriteAllText(paramFilename, FormContents);
            }

        }
    }
}