WPF Datagrid

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WPF

Hi All,
Please help me any body.

How to get the row value which is in Checked state of DataGridCheckBoxColumn in WPF Tool Kit DataGrid.

I have data grid with 2 columns, First column is UserId, 2 nd is checkboxcolumn and i have one Button outside the datagrid.

My requirement:
1) If the checkbox is selected on two rows,
and the user click on outside button i want to capture the userid of checked column.

How this can be achieved

if you send any samples more helpful to me.

Thanks in Advance,
Kartheesh M