Clean Code

public class Document
{
    public void Show()
    {
        // Visible Code
    }
    
    public void Hide()
    {
        // !Visible Code
    }
}

var stopwatch = Stopwatch.StartNew();

public void Method(Data data)
{
    // Use data.Value
}

public List<int> GetList()
{
    if (!isAvailable)
    {
        return new List<int>();
    }
}

if (condition)
{
    // Code
}