export datagrid to xml -plz give any other way

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please help me out to export a datagrid to an xml i used two ways but both exception are coming

DataTable dt = (DataTable)dataGrid2.DataSource; dt.WriteXml("t.xml",XmlWriteMode.IgnoreSchema);

in this exception like this arises Cannot serialize the DataTable. DataTable name is not set. (invalidoperationexception). please give a suitable method to export a datagrid to xml i even tried giving name to the dataTable still exception comes please help me with serialize

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