UseTemporary.cs

// Good
public static async Task<T> UseTemporary<T>(Func<string, Task<T>> func)
{
    var path = Path.GetTempFileName();
    try
    {
        return await func(path);
    }
    finally
    {
        File.Delete(path);
    }
}

// Bad
public static Task<T> UseTemporary<T>(Func<string, Task<T>> func)
{
    var path = Path.GetTempFileName();
    try
    {
        return func(path);
    }
    finally
    {
        File.Delete(path);
    }
}