Copying Datatable to Excel or Access file?

Hi,
I just wanna know that is there any easy way to copy a Datatable's data(or Dataset) to an Excel file? My codes are below;

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  SqlConnection bag_sql = new SqlConnection("Data Source=Mega;Initial Catalog=Config;User Id=WindsCm;Password=1abc;");
            bag_sql.Open();

            OleDbConnection bag_excel = new OleDbConnection("Provider=Microsoft.ACE.OLEDB.12.0;Data Source=hw.xlsx;Extended Properties=Excel 12.0 Xml;");
            bag_excel.Open();
           
            String query_router="SELECT * FROM Node WHERE Node_City='NY'";
            SqlDataAdapter oadp = new SqlDataAdapter(query_router, bag_sql);
            DataTable tbl_router = new DataTable();
            oadp.Fill(tbl_router);
            ...
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