使用VB.NET读取Excel时出错

我有这个代码来读取Excel文件

    Dim scheduleFileName As String

    'Creating Excel Object
    Dim fileName As String
    fileName = "E:\Vb Deployment\scheduling\scheduleSheet.xlsx"

    Dim objExcel As New Excel._ExcelApplication
    Dim objWrkBk As Excel.Workbook
    Dim objSht As Excel.Worksheet
    Dim testdata As String

    objWrkBk = GetObject(fileName)
    ' or objWrkBk = objExcel.Workbooks.Open("C:\test.xls")
    objSht = objWrkBk.Worksheets(0)

    testdata = objSht.Cells(1, 1).Value.ToString()

但它在网上给出了错误的答案

objSht = objWrkBk.Worksheets(0)

错误：找不到成员

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您能告诉我为什么会出现此错误以及如何更正它吗？

工作簿

有成员。唯一缺少的就是打字

objSht = CType(objWrkBk.Worksheets(0),  Excel.Worksheet)

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工作簿

没有成员。唯一缺少的就是打字

objSht = CType(objWrkBk.Worksheets(0),  Excel.Worksheet)