Application poor responsiveness in wp7 - windows-phone-7

Question

I am showing one MessageBox inside manipulationStarted event(or Tap Event ) of an image and that is causing App poor responsiveness when we perform store monitoring test in V2012.
Xaml Image control -
<Image HorizontalAlignment="Left" Height="100" VerticalAlignment="Top"
Width="104" Margin="90,60,0,0" Grid.Row="1"
ManipulationStarted="Image_ManipulationStarted_1"
Source="Background.png"/ >
Event Code –
private void Image_ManipulationStarted_1(object sender,
ManipulationStartedEventArgs e)
{
var m = MessageBox.Show("The file will be saved here.", "File Save", MessageBoxButton.OKCancel);
if (m == MessageBoxResult.OK)
{
int temp = 10;
}
}
When I perform "Automated tests" in open store test kit for above sample code, it is causing poor responsiveness and that cause to certification failure when we upload app the the market place. Here are the steps -
Right click on Application Name in the solution explore in Visual Studio 2012
Open store test kit -> Automated test -> Start Windows Phone Analysis -> Select App Analysis -> Click on Start Session (App will start)
Application Will start running
Perform the Tap event on the image, MessageBox will appear and click OK.
Click on End Session (App Will Exit) in V2012.
The result of App Analysis will be shown in Summary. In that summary you can see the Red Line in front of Responsiveness means the application responsiveness is poor which causes certification failure.
My requirement is like that only. I have one image (As a Button) and on click i.e Tap i want to do some operation.
Note – Build is targeted to WP7 but application is running on WP8 emulator.
Regards
Mukesh Sharma

Answer 1

Putting up a modal dialog inside an event handler will lock up the calling thread until the dialog is dismissed. That may give poor responsiveness rating.
What you may want to try is to in the event handler just disable the image for manipulation and dispatching the MessageBox to a time after the event handler has returned, something like (the untested);
private void Image_ManipulationStarted_1(object sender,
ManipulationStartedEventArgs e)
{
// <disable image manipulation here>
Deployment.Current.Dispatcher.BeginInvoke(() =>
{
var m = MessageBox.Show("The file will be saved here.",
"File Save", MessageBoxButton.OKCancel);
if (m == MessageBoxResult.OK)
{
int temp = 10;
}
// <enable image manipulation again>
}
}