private DataSet gravarXML(string arq)
        {
            DataSet ds = new SubSonic.Select("nome", "qnt", "data_v").From("clientes").InnerJoin("vendas", "idcliente", "clientes", "idclientes").WhereExpression("data_v").IsBetweenAnd(data1, data2).OrderAsc("data_v").ExecuteDataSet();
            ds.WriteXml(arq, XmlWriteMode.WriteSchema);
            return ds;
 }

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