iSpyApplication.MainForm.GetControlIndex C# (CSharp) Method

        private int GetControlIndex()
        {
            int i = 0;
            while (true)
            {

                bool b = _pnlCameras.Controls.Cast<Control>().Any(c => c.Tag as int? == i);
                if (!b)
                {
                    return i;
                }
                i++;
            }
        }