public MainPage()
{
InitializeComponent();
ServiceReference1.Service1Client client = new ServiceReference1.Service1Client();
client.getUsernamesAsync();
client.getUsernamesCompleted += client_getUsernamesCompleted;
}
void client_addUserCompleted(object sender, System.ComponentModel.AsyncCompletedEventArgs e)
{
ServiceReference1.Service1Client client = new ServiceReference1.Service1Client();
client.getUsernamesAsync();
client.getUsernamesCompleted += client_getUsernamesCompleted2;
}