A ref struct that will tweak values for you

usingForLazyPeople.cs

new ViewModel().Run();

class ViewModel
{
    private bool flag = true;
    public bool Flag {get; set;} = false;
    public void Run()
    {
        using(new HoldAndChangeValue(ref flag, () => Flag = !Flag))
        {
            InternalRun();
        }
        
        Console.WriteLine($"flag value is : {flag} - Inside 'Run'");
        Console.WriteLine($"Flag value is : {Flag} - Inside 'Run'");
    }
    
    
    void InternalRun()
    {
        Console.WriteLine($"flag value is : {flag} - Inside 'internalRun'");
        Console.WriteLine($"Flag value is : {Flag} - Inside 'Run'");
    }
}



ref struct HoldAndChangeValue
{
    ref bool _value;
    Action _action;
    
    public HoldAndChangeValue(ref bool value, Action action)
    {
        _value = ref value;
        _action = action;
    }
    
    public void Dispose()
    {
        _value = !_value;
        _action();
        Console.WriteLine($"flag value is : {_value} - Inside 'HoldAndChangeValue'");
    }
}