DataGrid get selected rows' column values

Solution based on Tonys answer:

        DataGrid dg = sender as DataGrid;
        User row = (User)dg.SelectedItems[0];
        Console.WriteLine(row.UserID);

UPDATED

To get the selected rows try:

IList rows = dg.SelectedItems;

You should then be able to get to the column value from a row item.

OR

DataRowView row = (DataRowView)dg.SelectedItems[0];

Then:

row["ColumnName"];