public IActionResult PostForm()
{
	HttpRequest request = this.HttpContext.Request;
	string requestBodyString;
	try
	{
		request.EnableBuffering();
		byte[] buffer = new byte[Convert.ToInt32(request.ContentLength)];
		request.Body.ReadAsync(buffer, 0, buffer.Length);
		requestBodyString = Encoding.UTF8.GetString(buffer);

		submission = new StiPdfFormSubmission();
		submission.ParseXFDF(buffer);

		dataChanged = true;
	}
	finally
	{
		request.Body.Position = 0;
	}

	return new ContentResult(); 
}

public IActionResult GetPdf()
{
	var form = new StiForm();
	form.Load(FormPath);

	if (submission != null)
	{
		var data = submission.ConvertData(form);
		StiFormFillHelper.FillForm(form, data);
	}
	(form.GetElementByName("Button") as StiButtonElement).Visible = false;
            
	StiPdfExporter exporter = new StiPdfExporter();
	var pdf = exporter.ExportForm(form);

	dataChanged = false;

	return new FileContentResult(pdf, "application/pdf"); 
}