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Hi I am Rob and I am available to help you, please bare with me while I consider what you have said.
Are you developing Windows Store Apps in Visual Studio 2013?
For groups in the listView
please visit https://msdn.microsoft.com/en-us/library/system.windows.forms.listview.groups(v=vs.110).aspx
To validate any app
please visit https://msdn.microsoft.com/en-us/library/hh454036.aspx#BeforePackaging
To reorder ListView Item:
myListView.Sorting = SortOrder.Ascending;
I am afraid that this is question is a little bit out of my area of expertise, I am going to refer you back to the other experts.