Check checkboxes are checked in ListView UWP

I have a ListView, that contains 22 CheckBoxes. I should to check all of them, and if checkBox is checked it returns 1, otherwise 0.

                 < ListView x: Name = "CheckBoxList" >  
                   < CheckBox x: Name = "nr1" />
                    ...    
                   < CheckBox x: Name = "nr22" />
                  </ListView>

And here I send thouse 1 or 0

            dynamic sendMessage = MyApi.Api.sendMessage( //for example 1, 0, 1, 1, 0, 0 etc.//);

How to make it automatically? Because all I know is how to check it manually (if - else for every control), but it isn't good solution.