public int MaxValue()
 {
     buti = new buti();
     Maximum = buti.getIdValues();
     if (Maximum != null)
     {
         foreach (var r in Maximum)
         {
             //lstTest.Items.Add(r.IdNumber);
             arrayID.Add(r.IdNumber);
         }
     }
     int count = arrayID.Count;
     return arrayID[count - 1];
 }