专家坐堂-窗口加载树Foxtable(狐表) - 新一代数据库软件，完美融合Access、Foxpro、Excel、vb.net之优势，人人都能掌握的快速软件开发工具!

-- 窗口加载树

我的后台数据库是ACCESS

窗口的AfterLoad事件代码：

Dim cmd As New SQL Command
Dim dt As DataTable
cmd.CommandText = "SELECT DISTINCT Year(报价日期) As 年, Month(报价日期) As 月, 客户 F rom {报价主表}"
dt = cmd.ExecuteReader()
Dim trv As WinForm.TreeView = e.Form.Controls("TreeView1")
trv.BuildTree(dt, "年|月|客户")

目录树的NodeMouseDoubleClick事件代码

Dim dr As DataRow = e.Node.DataRow \'获取生成此节点的行
Dim Filter As String
Dim Year As Integer = dr("年")
Dim Month As Integer = dr("月")
Dim Product As String = dr("客户")
Select C ase e.N ode.Level
Case 0
Filter ="Year(日期) = " & Year
Case 1
Filter ="Year(日期) = " & Year & " And Month(报价日期) = " & Month
Case 2
Filter ="Year(日期) = " & Year & " And Month(报价日期) = " & Month & " And 客户 = \'" & Product & "\'"
End Select
DataTables("报价主表").LoadFilter = Filter
DataTables("报价主表").Load()

这是我照抄的，为什么不行？是不是ACCESS数据库的写法不是这样？

提示：（Microsoft Jet 数据库引擎找不到输入表或查询 \'~TMPCLP报价主表\'。确定它是否存在，以及它的名称的拼写是否正确。）

错误所在事件：窗口,主窗口,AfterLoad

详细错误信息：

Object reference not set to an instance of an object.

请老师指点