If you are using ADO.NET, then just create data row of the table dataRow = dt.newrow(); And do dt.row.add(dataRow); do not forget to do dt.acceptChanges(); .
As WPF binding works in both direction and each UI element update itself, so in this case once row will get added to datatable and if same is applied to grid then grid will get updated automatically.
summery.
1. you just need to add row in datatable.
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