Problem with creating file in task chain

Question

Hi all,

Now I am suffering another problem with the following code:

create_task(Windows::Storage::ApplicationData::Current->LocalFolder->CreateFolderAsync(L"XML", CreationCollisionOption::OpenIfExists)).then([this, folderCode](StorageFolder^ folder) ->IAsyncOperation<StorageFile^>^
{
return folder->CreateFileAsync(L"recent_list.xml", CreationCollisionOption::OpenIfExists);
}).then([this](StorageFile^ file)->IAsyncOperation<XmlDocument^> ^{
return XmlDocument::LoadFromFileAsync(file);
}).then([this](XmlDocument^ doc){
mXMLDocument = doc;
});

The code above can be built successfully as well, but it is being executing, part of them will not be executed which is following:

        }).then([this](StorageFile^ file)->IAsyncOperation<XmlDocument^> ^{
return XmlDocument::LoadFromFileAsync(file);
}).then([this](XmlDocument^ doc){
mXMLDocument = doc;
});

Does any one knows what is wrong with those code? I do appreciate your help.