best C# design pattern to process data from cloud?

We have to connect cloud service to get data for every 30 seconds and would like to do some operations with that data. Based on the data, i need to apply different logic. Let us say I am getting 5 rows from cloud, 1st row would need to go under rule 1 logic, 2nd would be in rule 2 logic, 3rd one with rule 3 logic, 4 & 5 would be rule 1 logic. How can i do this effectively? Expected number of rows would be appx 10,000 for 30 seconds. Please let me know a better design pattern to handle this.