New Post: File not disposed after use

privatevoid btnRun_Click(object sender, EventArgs e)
        {
            comprexFile(@"d:\backup\emanuele.zip", @"D:\toZipping\10122014\2012-06-01-08-18-04-6567-007.batchstate");
        }

        privatevoid comprexFile(string zipFile, string fileToArchive)
        {
            checkZipFile(zipFile);
            using (var zipArchive = ZipArchive.Open(zipFile, null))
            {
                FileInfo fInfo = new FileInfo(fileToArchive);
                zipArchive.AddEntry(fileToArchive, fInfo);

                using (Stream zipStream = File.OpenWrite(zipFile))
                {
                    CompressionInfo cInfo = new CompressionInfo();
                    cInfo.Type = CompressionType.None;
                    zipArchive.SaveTo(zipStream, cInfo);
                }
            }
        }

        privatevoid checkZipFile(string zipFile)
        {
            if (!File.Exists(zipFile))
            {
                using (var myArchive = ZipArchive.Create())
                {
                    using (Stream zipStream = File.Create(zipFile))
                    {
                        CompressionInfo cInfo = new CompressionInfo();
                        cInfo.Type = CompressionType.None;
                        myArchive.SaveTo(zipStream, cInfo);
                    }

                }
            }
        }