如何删除从CSV文件解析返回的文本周围文本

Question

我使用下面的代码编制纳斯达克证券交易所的股票代码清单。我使用的是位于此处的CSV文件：http://www.nasdaq.com/screening/companies-by-industry.aspx?exchange=NASDAQ&render=download

当我在Excel中打开CSV文件时，股票代码符号周围没有引号。但是当我运行下面的代码时。返回到我列表的所有股票代码都有引号。为什么是这样？我该如何摆脱引号？

这是我的代码：

Public Shared tickerList As New List(Of String)
Dim compositeList As New List(Of String) 
Dim strBuffer As String
        strBuffer = Historical_Stock_Prices.RequestWebData(http://www.nasdaq.com/screening/companies-by-industry.aspx?exchange=NASDAQ&render=download)
        Dim sReader As New StringReader(strBuffer)
        Dim Line_List As New List(Of String)
        Do While sReader.Peek >= 0
            Line_List.Add(sReader.ReadLine)
        Loop
        Line_List.RemoveAt(0)
        For Each Line In Line_List
            compositeList.Add(Line.Split(",")(0).Trim.ToLower)
        Next
        sReader.Close()
tickerList = compositeList.Distinct.ToList
tickerList.Sort()

Answer 1

compositeList.Add(Line.Split(",")(0).Trim(New Char() {""""}).ToLower)

Answer 2

myString = myString.Substring(1, myString.Length -1)

这将删除第一个和最后一个字符。