private void PasteCharInPassword(int position, char symbol)
        {
            string string1 = CurrentPassword.Insert(position, symbol.ToString());
            string string2 = string1.Remove(position + 1, 1);

            CurrentPassword = string2;
        }
 private void IncrementPassword(int position)
 {
     if (CurrentPassword[position].Equals('9'))
     {
         PasteCharInPassword(position, 'a');
         return;
     }
     if (CurrentPassword[position].Equals('z'))
     {
         PasteCharInPassword(position, 'A');
         return;
     }
     if (CurrentPassword[position].Equals('Z'))
     {
         if (position == 0)
         {
             string str = CurrentPassword.Insert(position, '0'.ToString());
             CurrentPassword = str;
             PasteCharInPassword(position + 1, '0');
             return;
         }
         else
         {
             PasteCharInPassword(position, '0');
             IncrementPassword(position - 1);
         }
     }
     else
     {
         char symb = CurrentPassword[position];
         symb++;
         PasteCharInPassword(position, symb);
     }
 }