foreach (var o in state.s)
        {
            TimeSpan timeDiff = (DateTime.Now - o.time);
            if (timeDiff.TotalSeconds < 300)
            {
                richTextBox.AppendColoredText(o.name + " ", Color.Green);
            }
            else
            {
                richTextBox.AppendColoredText(o.name + " ", Color.Red);
                if (f == false)
                {
                    listA.Add(o.name);
                    listA_clone.Add(o.name);
                }
                else
                {
                    listA.Add(o._name);
                }
            }
        }

foreach (var o in state.s) {
        TimeSpan timeDiff = (DateTime.Now - o.time);
        if (timeDiff.TotalSeconds < 300) {
            richTextBox.AppendColoredText(o.name + " ", Color.Green);
        } else {
            richTextBox.AppendColoredText(o.name + " ", Color.Red);
            if (f == false) {
                listA.Add(o.name);
                listA_clone.Add(o.name);
            } else {
                listA.Add(o._name);
            }
        }
    }

foreach (var o in state.s)
{
    TimeSpan timeDiff = (DateTime.Now - o.time);
    if (timeDiff.TotalSeconds < 300)
    {
        richTextBox.AppendColoredText(o.name + " ", Color.Green);
        continue;
    }
    if (!f)
    {
        listA_clone.Add(o.name);
    }
    richTextBox.AppendColoredText(o.name + " ", Color.Red);
    listA.Add(o.name);
}

foreach (var o in state.s)
        {
            Color col = (DateTime.Now - o.time).TotalSeconds < 300 ? Color.Green : Color.Red;
            richTextBox.AppendColoredText(o.name + " ", col);
            if(col == Color.Red)
            {
                listA.Add(o.name);
                if (!f) { listA_clone.Add(o.name); }
            }
        }