主题：sheet(4,3) 4变成循环的i 读取不出来数

For Each file As String In filesys .GetFiles("c:\Data")
    If file.EndsWith(".xls") OrElse file.EndsWith(".xlsx") Then
        Dim Book As New XLS.Book(file)
        Dim Sheet As XLS.Sheet = Book.Sheets(0)
        Dim dr As DataRow = DataTables("员工").AddNew
        dr("姓名") = sheet(4,1).Text
        dr("部门") = sheet(5,1).text
        dr("出生日期") = sheet(4,3).text
        dr("雇佣日期") = sheet(5,3).text
        dr("性别") = sheet(6,1).text
        dr("职务") = sheet(6,3).text
        dr("地址") = sheet(7,1).text
        dr("家庭电话") = sheet(8,1).text
        dr("办公电话") = sheet(8,3).text
        dr("备注") = sheet(9,0).text
    End If
Next

sheet(4,3)  4变成循环的i 读取不出来数   如下：

For Each file As String In filesys .GetFiles("c:\Data")

    If file.EndsWith(".xls") OrElse file.EndsWith(".xlsx") Then

        Dim Book As New XLS.Book(file)

        Dim Sheet As XLS.Sheet = Book.Sheets(0)

        Dim dr As DataRow = DataTables("表A").AddNew

        Dim i As Integer

        For i = 1 To 10 Step 1

            If  sheet(i,0).Value IsNot Nothing Then

                dr("表名") = file

                dr("标题") = sheet(0,0).Value

                dr("规格") = sheet(i,0).Text

                dr("报价") = sheet(i,2).Value

                dr("美元每米") = sheet(i,8).Value

                dr("利润点") = sheet(i,7).Value

            End If

        Next

        output.show(sheet(i,0).Value)

    End If

Next