StateMachineExamples.cs

public class StateMachineExamples
{
    // Inefficient use of async
    public async Task<string> InefficientMethodAsync()
    {
        // This method is marked as async, but it lacks any await statements.
        // As a result, the compiler generates a state machine which is unnecessary.
        return "Hello, World!";
    }

    // Efficient alternative
    public Task<string> EfficientMethod()
    {
        // Without the async keyword, the method directly returns a completed task.
        // No state machine is generated, which makes it more memory-efficient.
        return Task.FromResult("Hello, World!");
    }
}

// In summary:
// 1. The async keyword instructs the compiler to generate a state machine.
// 2. This state machine handles the mechanics of pausing and resuming a method's execution around await points.
// 3. If there are no await points (i.e., no asynchronous operations), the state machine is unnecessary.
// 4. In high-throughput scenarios, unnecessary state machines can contribute to memory pressure and negatively affect performance.