How do I get checked checkbox values from listveiw ?

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WPF

C#4.0

Hello everyone,

I have Listview items with checkboxes and image buttons. Please find the screen show from below url.

https://s24.postimg.org/mh7pdjb2t/image.png

I want two scenario...

1) After select one row, then click on fist image button - want to get one row listview details in code behind (Now it's happening). Please find the screen show from below url.

https://s29.postimg.org/iej2k9mzb/image.png

2) After select one or more checkboxes then click on the second image button - want to get whole checked items from the listview. Please find the screen show from below url.

https://s23.postimg.org/z18o84qsb/image.png

But after applying this code not getting all checkbox selected items.

<GridViewColumn>
                                            <GridViewColumn.CellTemplate>
                                                <DataTemplate>
                                                    <CheckBox Tag="{Binding UserId}" Checked="CheckBox_Checked" Unchecked="CheckBox_Unchecked" />
                                                </DataTemplate>
                                            </GridViewColumn.CellTemplate>
                                        </GridViewColumn >

I know this is because of not using this code inside the checkbox shown below.

<CheckBox Tag="{Binding UserId}" Checked="CheckBox_Checked" Unchecked="CheckBox_Unchecked" IsChecked="{Binding RelativeSource={RelativeSource AncestorType=ListViewItem},Path=IsSelected}" />

But I don't want this code because after implementing this code, then click on the listview's row automatically selecting checkbox too.

What I have tried:

After select all check-boxes, then want to get all listview items here,

foreach (DocumentsUser item in listView1.SelectedItems)
                    {}

How can I handle this? Please help me...