Page 132 - CSharp/C#

bool result = TryThis().Result;
// Never actually gets here
Trace.TraceInformation("Done with result");
}

Essentially, once the async call completes, it waits for the synchronization context to become
available. However, the event handler "holds on" to the synchronization context while it's waiting
for the TryThis() method to complete, thus causing a circular wait.

To fix this, code should be modified to

private async void button1_Click(object sender, EventArgs e)
{
bool result = await TryThis();
Trace.TraceInformation("Done with result");
}

Note: event handlers are the only place where async void should be used (because you can't await
an async void method).

Async/await will only improve performance if it allows the machine to do

additional work

Consider the following code:

public async Task MethodA()
{
await MethodB();
// Do other work
}

public async Task MethodB()
{
await MethodC();
// Do other work
}

public async Task MethodC()
{
// Or await some other async work
await Task.Delay(100);
}

This will not perform any better than

public void MethodA()
{
MethodB();
// Do other work
}

public void MethodB()
{
MethodC();

https://riptutorial.com/ 78