Following diagram shows generic 3-layer architecture:

How does each layer programmatically communicate with each other? Apply relevant code snippet in C# to show communication as shown in the above diagram. Assume any scenario or example to elaborate your answer. (10 marks)

(b) Suppose are are asked to make your 3-layer application a 3-tier application as well. How would you achieve this? (5 marks)

Presentation Layer Business Logic Layer Data Access Layer Data Source Presentation Layer Business Logic Layer Data Access Layer Data Source