Append contacts in contact list in WP8 - windows-phone-8

Question

I want to add more that one contacts to contact list from a xml file, but saveContactTask.Show();
added one contact to contact list, Please anyone tell me how to resolve this issue .
This is my code:
private void AddContacts(object sender, RoutedEventArgs e)
{
using (IsolatedStorageFile istf = IsolatedStorageFile.GetUserStoreForApplication())
{
using (IsolatedStorageFileStream istfs = istf.OpenFile("MyContacts.xml",FileMode.Open))
{
XDocument doc = XDocument.Load(istfs);
var query = from d in doc.Root.Descendants("Contacts")
select new
{
firstName = d.Element("name").Value,
mobilePhone = d.Element("phone").Value
};
foreach (var po in query)
{
saveContactTask.FirstName = po.firstName;
saveContactTask.MobilePhone = po.mobilePhone;
saveContactTask.Show();
}
}
}

Answer 1

SaveContactTask class is designed to add only one contact at a time and Show() function is asynchronous. You can't add second contact until the first call will be finished. Your code should be rewritten to react on saveContactTask.Completed += new EventHandler<SaveContactResult>(saveContactTask_Completed); event and start adding the second(etc) contact only when the previous is finished. There is possibility, that new SaveContactTask should be used for the second(etc) contact, bear it in mind.
Try something like this (it's only a sample of idea):
private List<Contact> listToAdd;
private SaveContactTask saveTask;
saveTask.Completed += addComplete;
void addComplete(...)
{
if ( listToAdd.Count > 0 )
{
Contact contact = listToAdd[0];
listToAdd.RemoveAt(0);
saveTask. (set values from contact)
saveTask.Show();
}
}