Pasted

private static void Decompress(FileInfo fileToDecompress, bool overwrite = false)
{
    if ((File.Exists(fileToDecompress.FullName) && overwrite) ||
         !File.Exists(fileToDecompress.FullName))
    {
        using (FileStream originalFileStream = fileToDecompress.OpenRead())
        {
            string currentFileName = fileToDecompress.FullName;
            string newFileName = currentFileName.Remove(currentFileName.Length - fileToDecompress.Extension.Length);
 
            using (FileStream decompressedFileStream = File.Create(newFileName))
            {
                using (GZipStream decompressionStream = new GZipStream(originalFileStream, CompressionMode.Decompress))
                {
                    decompressionStream.CopyTo(decompressedFileStream);
                }
            }
        }
    }
}