主题：应为语句结束是什么意思

Dim ex As New Exporter
ex.SourceTableName = "导出文本"
ex.Fields = "日期","代码","特买"
ex.FilePath = "e:\文本数据\"
ex.Format = "Fixed"
ex.NewTableName = "文本数据"
ex.Export()

我在输出例子中加入第三行输出指定列，提示：ex.Fields = "日期","代码","特买"应为语句结束。

不知错在哪里？