Something like that maybe:
void Grupa1_DataChange(int TransactionID, int NumItems, ref Array ClientHandles, ref Array ItemValues, ref Array Qualities, ref Array TimeStamps)
{
Array tmpClientHandles = ClientHandles;
Array tmpItemValues = ItemValues;
Array tmpQualities = Qualities;
Array tmpTimeStamps = TimeStamps;
ThreadPool.QueueUserWorkItem(o =>
{
//Here I read my data and pass them to my variables(and this is
//runned every second) and I want this method to run in new thread.
ItemNumItems = NumItems;
ItemClientHandles = tmpClientHandles;
ItemServerValues = tmpItemValues;
ItemQualities = tmpQualities;
ItemTimeStamps = tmpTimeStamps;
});
}
?
But why to you want to run it asynchronously?
From the code you show there is nothing that will gain to being run in parallel.