private void SetPurview(int Purview)
 {
     for (int i = 0; i < CLB_Purview.Items.Count; i++)
     {
         int K = (int)Math.Pow(2, i + 1);
         if ((Purview & K) == K)
         {
             CLB_Purview.SetItemChecked(i, true);
         }
     }
 }
        private int GetPurview()
        {
            int Purview = 0;

            for (int i = 0; i < CLB_Purview.Items.Count; i++)
            {
                if (CLB_Purview.GetItemChecked(i))
                {
                    Purview += (int)Math.Pow(2, i + 1);
                }
            }

            return(Purview);
        }