Как сохранить настройки на форме?

using System;
using System.Windows.Forms;
namespace WindowsFormsApplication2
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
 
        private void Form1_Load(object sender, EventArgs e)
        {
            dataGridView1.Columns[0].Width = Convert.ToInt32(Properties.Settings.Default.width);
        }
 
        private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {
            Properties.Settings.Default.width = this.dataGridView1.Columns[0].Width.ToString();
            Properties.Settings.Default.Save();
        }
    }
}

using System;
using System.Windows.Forms;
namespace WindowsFormsApplication2
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
 
        private void Form1_Load(object sender, EventArgs e)
        {
            dataGridView1.Columns[0].Width = Properties.Settings.Default.width;
        }
 
        private void Form1_FormClosing(object sender, FormClosingEventArgs e)
        {
            Properties.Settings.Default.width = this.dataGridView1.Columns[0].Width;
            Properties.Settings.Default.Save();
        }
    }
}

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.Configuration;
 
namespace ConfigSectionDemo {
    public partial class MainForm : Form {
        public MainForm() {
            InitializeComponent();
            loadBtn.Click += new EventHandler(loadBtn_Click);
            saveBtn.Click += new EventHandler(saveBtn_Click);
        }
 
        void saveBtn_Click(object sender, EventArgs e) {
            Configuration cfg = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
            CustomSection section = cfg.GetSection("customSection") as CustomSection;
            if (section != null) {
                section.Name = userNameTxt.Text;
                section.Age = int.Parse(userAgeTxt.Text);
                cfg.Save();
            }
        }
 
        void loadBtn_Click(object sender, EventArgs e) {
            Configuration cfg = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
            CustomSection section = cfg.GetSection("customSection") as CustomSection;
            if (section != null) {
                userNameTxt.Text = section.Name;
                userAgeTxt.Text = section.Age.ToString();
            }
        }
    }
    public class CustomSection : ConfigurationSection {
        [ConfigurationProperty("name", IsRequired=false)]
        public string Name {
            get { return (string)base["name"]; }
            set { base["name"] = value; }
        }
        [ConfigurationProperty("age", IsRequired=false)]
        public int Age {
            get { return (int)base["age"]; }
            set { base["age"] = value; }
        }
    }
}