Refresh from data source from class in AX7 / D365

Table tableBuffer;
FormDataSource formDataSource;
tableBuffer = _args.record();
formDataSource = FormDataUtil::getFormDataSource(tableBuffer);
formDataSource.research();

X++ code to read CSV file in AX7 / D365

AsciiStreamIo file;
Array fileLines;
FileUploadTemporaryStorageResult fileUpload;
fileUpload = File::GetFileFromUser() as FileUploadTemporaryStorageResult;
file = AsciiStreamIo::constructForRead(fileUpload.openResult());
if (file)
{
if (file.status())
{
throw error("@SYS52680");
}
file.inFieldDelimiter(',');
file.inRecordDelimiter('\r\n');
}
container record;
while (!file.status())
{
record = file.read();
if (conLen(record))
{
info(strFmt("%1 - %2",conPeek(record,1),conPeek(record,2)));
}
}