ConfigureAwait(false) Prevents Deadlocks

ConfigureAwait(false) avoids deadlocks in UI and ASP.NET synchronization contexts.

Before (Deadlock Risk)

Blocking the async operation in a UI application causes deadlocks.

public void DoSomething()
{
    var result = GetDataAsync().Result; // Deadlocks if GetDataAsync resumes on UI thread
}


public async Task<string> GetDataAsync()
{
    await Task.Delay(1000);
    return "Hello";
}

After (Deadlock Fixed)

Using ConfigureAwait(false), continuation runs on a thread pool instead of the UI thread.

public void DoSomething()
{
    var result = GetDataAsync().ConfigureAwait(false).GetAwaiter().GetResult(); // No deadlock
}


public async Task<string> GetDataAsync()
{
    await Task.Delay(1000).ConfigureAwait(false);
    return "Hello";
}