private void Xml_Process_Button_Click(object sender, RoutedEventArgs e)
{
double sumTotalPrice = 0;
double sumTotalPriceWithQuantity = 0;
int counterItems = 0;
double priceAverageValue = 0;
var xmlData = XmlProcessor.LoadXml(pathOfXmlFileTextBlock.Text);
foreach (var item in xmlData.Items)
{
foreach (var i in item.Item)
{
sumTotalPrice = sumTotalPrice + Convert.ToDouble(i.Price.Replace(".", ","));
sumTotalPriceWithQuantity = sumTotalPriceWithQuantity + Convert.ToDouble(i.Price.Replace(".", ",")) * Convert.ToInt16(i.Quantity);
counterItems++;
}
}
priceAverageValue = sumTotalPrice / counterItems;
displayValues(xmlData.Id.ToString(), xmlData.Customer, convertDate(xmlData.Date), convertDoubleToSeparatedDouble(priceAverageValue), convertDoubleToSeparatedDouble(sumTotalPriceWithQuantity));
}