如何获取C盘应用程序文件夹的访问权限？

Question

以下是电子邮件临时商店附件的代码。这段代码适用于我的应用程序。当我折痕EXE文件。我收到这个错误：

  

＆＃34;访问路径＆＃39; C：\ Program Files（x86）\ Application Name \ Temp＆＃39;是   否认＆＃34;

if (!Directory.Exists(String.Format("{0}\\Temp", Application.StartupPath)))
    Directory.CreateDirectory(String.Format("{0}\\Temp", Application.StartupPath));
FileInfo f = new FileInfo(String.Format(@"{0}\Temp\{1}", Application.StartupPath, Atchment.Filename));
if (!f.Exists)
{
    using (var fs = new FileStream(String.Format(@"{0}\Temp\{1}", Application.StartupPath, Atchment.Filename), FileMode.Create))
    {
        int fileLength = (int)Atchment.FileSize;
        byte[] rawdata = (byte[])Atchment.File;
        int byteCount = rawdata.Length;
        fs.Write(rawdata, 0, byteCount);
    }
}

我已经DirectorySecurity folderSecurity = Directory.GetAccessControl(path);同意了，但它没有成功。我做错了什么？