[DllImport("user32.dll")]
[return: MarshalAs(UnmanagedType.Bool)]
private static extern bool SetForegroundWindow(IntPtr hWnd);

private void CopyButton_Click(object sender, EventArgs e)
{
    var items = new Dictionary<long, string>();
    foreach (var info in _controls.Values)
    {
        var damageValue = info.PlayerInfo.Dealt.Damage;
        string damageFraction = Helpers.FormatPercent((double)damageValue / info.TotalDamage);
        string damage = Helpers.FormatValue(damageValue).Replace((char)8201, ' ');
        items.Add(damageValue, $"{info.PlayerInfo.Name} {damage} ({damageFraction})");
    }
    if (items.Count > 0)
    {
        var gameProcess = Process.GetProcessesByName("TERA").FirstOrDefault();
        if (gameProcess != null)
        {
            SetForegroundWindow(gameProcess.MainWindowHandle);
            var simulator = new InputSimulator();
            simulator.Keyboard.Sleep(100);
            simulator.Keyboard.KeyPress(VirtualKeyCode.RETURN);
            simulator.Keyboard.Sleep(100);
            simulator.Keyboard.TextEntry(string.Join(" | ", items.OrderByDescending(x => x.Key).Select(x => x.Value)));
        }
    }
}