How to read & write file in isolation storage in c#

How to read & write file in isolation storage in 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.IO.IsolatedStorage;
using System.Diagnostics;

namespace Program
{
        //Variable
        string FullLine;
        const string ISOLATED_FILE_NAME = "Setting.txt";
        IsolatedStorageFile isoStore = IsolatedStorageFile.GetStore(IsolatedStorageScope.User | IsolatedStorageScope.Assembly, null, null);

        private void ISOStorageUse_Load(object sender, EventArgs e)
        {
            cbYesNo.Text = "No";
            ddlStandard.SelectedIndex = 0;
           
            #region Get Data
            IsolatedStorageFileStream iStream = new IsolatedStorageFileStream(ISOLATED_FILE_NAME, FileMode.OpenOrCreate, isoStore);
            StreamReader reader = new StreamReader(iStream);
            FullLine = reader.ReadToEnd();
            reader.Close();
            #endregion Get Data

            #region Apply Value
            string SplitPart = FullLine.Replace("\r\n", ",");
            string[] Parts = SplitPart.Split(',');

            if (SplitPart == "") return;
            dtpDate.Value = Convert.ToDateTime(Parts[0]);
            tbName.Text = Parts[1];
            ddlStandard.SelectedIndex = Convert.ToInt32(Parts[2]);
            cbYesNo.Checked = Convert.ToBoolean(Parts[3]);
            #endregion Apply Value
        }

       // Form Closing Event
       private void ISOStorageUse_FormClosing(object sender, FormClosingEventArgs e)
       {
            // Write some text into the file in isolated storage.
            IsolatedStorageFileStream oStream = new IsolatedStorageFileStream(ISOLATED_FILE_NAME, FileMode.OpenOrCreate, isoStore);
            StreamWriter writer = new StreamWriter(oStream);
            writer.WriteLine(dtpDate.Value);
            writer.WriteLine(tbName.Text);
            writer.WriteLine(ddlStandard.SelectedIndex);
            writer.WriteLine(cbYesNo.Checked);
            writer.Close();
       } 
}