Необходимо исправить ошибку в коде - C# - Ответ 9164652

  public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
 
        private void button1_Click(object sender, EventArgs e)
        {
            string newfile = "wocao.txt";
            FileStream fs1 = new FileStream(newfile, FileMode.OpenOrCreate);
            FileSecurity fileSecurity = fs1.GetAccessControl();
            IdentityReference identityReference = fileSecurity.GetOwner(typeof(NTAccount));
            listBox2.Items.Add(identityReference.Value);
 
            AuthorizationRuleCollection dost = fileSecurity.GetAccessRules(true, true, typeof(NTAccount));
            foreach (AuthorizationRule rule in dost)
            {
                var fileRule = rule as FileSystemAccessRule;
                listBox3.Items.Add("Access type:" + fileRule.AccessControlType + "   Rights: " + fileRule.FileSystemRights + "   Identity:" + fileRule.IdentityReference.Value);
            }
 
            AuthorizationRuleCollection audit = fileSecurity.GetAuditRules(true, true, typeof(NTAccount));
            foreach (AuthorizationRule rule in audit)
            {
                var fileRule = rule as FileSystemAuditRule;
                listBox4.Items.Add("Audit Flags:" + fileRule.AuditFlags + "   Rights: " + fileRule.FileSystemRights + "   Identity:" + fileRule.IdentityReference.Value);
            }
            FileSystemAccessRule acR = new FileSystemAccessRule("Admin",FileSystemRights.Write, AccessControlType.Allow);
            fileSecurity.AddAccessRule(acR); 
            File.SetAccessControl(newfile, fileSecurity);
 
            AuthorizationRuleCollection dost2 = fileSecurity.GetAccessRules(true, true, typeof(NTAccount));
            foreach (AuthorizationRule rule in dost2)
            {
                var fileRule = rule as FileSystemAccessRule;
                listBox5.Items.Add("Access type:" + fileRule.AccessControlType + "   Rights: " + fileRule.FileSystemRights + "   Identity:" + fileRule.IdentityReference.Value);
            }
 
            AuthorizationRuleCollection audit2 = fileSecurity.GetAuditRules(true, true, typeof(NTAccount));
            foreach (AuthorizationRule rule in audit2)
            {
                var fileRule = rule as FileSystemAuditRule;
                listBox6.Items.Add("Audit Flags:" + fileRule.AuditFlags + "   Rights: " + fileRule.FileSystemRights + "   Identity:" + fileRule.IdentityReference.Value);
            }
        }
 
        private void Form1_Load(object sender, EventArgs e)
        {
 
        }
    }
}