private void Load()
{
CurrentPage = 1;
ISFirst = false;
TotalRecords = _saleServ.GetSalesNumer(Key);
LastPage = (int)Math.Ceiling(Convert.ToDecimal((double)_saleServ.GetSalesNumer(_key) / 17));
if (_lastPage == 0)
{
LastPage = 1;
}
if (_lastPage == 1)
{
ISLast = false;
}
else
{
ISLast = true;
}
Sales = new ObservableCollection <Sale>(_saleServ.SearchSales(_key, _currentPage));
}