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using `async` and `await` in .net is crucial for writing non-blocking code, especially in i/o-bound applications, but there are situations where their use can be inappropriate or lead to performance issues. here’s a tutorial on when you shouldn’t use `async` and `await`, along with code examples to illustrate these points.

when not to use `async` and `await`

1. **cpu-bound operations**: if your method is performing cpu-bound operations, using `async` and `await` doesn’t provide any benefits. in these cases, you should use synchronous code or consider parallelism with tasks, like `parallel.foreach`.

**example**:
```csharp
public int calculatefactorial(int number)
{
if (number == 0) return 1;
return number * calculatefactorial(number - 1);
}
```

here, using `async` and `await` would not help improve performance since the method is cpu-bound.

2. **ineffective use of async**: if the asynchronous operation does not need to be awaited, you should not use `async` and `await`. for example, if you're starting a fire-and-forget task without the need to wait for its completion.

**example**:
```csharp
public void fireandforget()
{
task.run(() = {
// some long-running operation
thread.sleep(1000); // simulating work
console.writeline("operation completed.");
});
// no await here; we're intentionally not waiting
}
```

3. **synchronous context**: in ui applications, if you call `async` methods from the ui thread, you may introduce deadlocks if you do not configure `await` properly. instead, you should run your async code in a way that doesn’t block the ui thread.

**example**:
```csharp
private void button_click(object sender, eventargs e)
{
// this can lead to a deadlock in some cases
var result = longrunningoperation().result; // blocking call
}

private async taskstring longrunningoperation()
{
await task.delay(1000); // ...

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