FileStream fsXslt       = null;
FileStream fsInput      = null;
FileStream fsExtensions = null;
FileStream outStream    = null;

try
{
	// Преобразование
	fsXslt         = new FileStream(xsltPath, FileMode.Open, FileAccess.Read);
	fsInput        = new FileStream(instancePath, FileMode.Open, FileAccess.Read);
	fsExtensions   = (extensionPath != null) && (extensionPath.Length > 0) ? new FileStream(extensionPath, FileMode.Open, FileAccess.Read) : null;
	BizTalkMap map = new BizTalkMap(fsXslt, fsExtensions);

	Stream sOut = map.TransformInstance(fsInput);

	// Сохраняем результат в файл
	string destPath = Path.Combine(Path.GetDirectoryName(instancePath), Path.GetFileName(instancePath) + «.trans.xml»);
	outStream = new FileStream(destPath, FileMode.Create, FileAccess.Write);
	outStream.Write(((MemoryStream) sOut).ToArray(), 0, (int) sOut.Length);
}
finally
{
	if (fsXslt       != null) fsXslt.Close();
	if (fsInput      != null) fsInput.Close(); 
	if (fsExtensions != null) fsExtensions.Close();
	if (outStream    != null) outStream.Close(); 
}

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