主题：不能自动加载符合条件的数据

1、首先在BeforeLoadInnerTable事件加入下面的代码，确保订单表初始状态不会加载任何数据：

If e.DataTableName = "订单" Then
    e.Filter = "[_Identify] Is Null"
End If

2、然后修改用户登录窗口的“确定”按钮的代码，在后面加上加载数据的代码：

Dim UserName As String = e.Form.Controls("UserName").Value
Dim cmd As New SQLCommand
Dim dt As DataTable
Dim dr As DataRow
cmd.ConnectionName = "User"
If UserName = "" Then
    Messagebox.show("请选择用户!","提示",MessageBoxButtons.OK,MessageBoxIcon.Information)
    Return
End If
cmd.CommandText = "Select * From {Users} Where [Name] = '" & UserName & "'"
dt = cmd.ExecuteReader
dr = dt.DataRows(0)
If e.Form.Controls("PassWord").Value = dr("Password") Then
    _UserName = UserName
    _UserGroup = dr("Group")
    e.Form.Close
Else
    Messagebox.show("密码错误!","提示",MessageBoxButtons.OK,MessageBoxIcon.Information)
End If
DataTables("订单").LoadFilter = "业务员 = '" & _UserName & "'"
DataTables("订单").Load()

上面代码的最后两行，就是用于根据登录用户名动态加载订单表数据的：

DataTables("订单").LoadFilter = "业务员 = '" & _UserName & "'"
DataTables("订单").Load()

用这个方法怎么不能实现预期效果呢？什么数据也没有？请问是怎么回事？

Dim UserName As String = e.Form.Controls("UserName").Value
Dim cmd As New SQLCommand
Dim dt As DataTable
Dim dr As DataRow
cmd.C
If UserName = "" Then
    Messagebox.show("请选择用户!","提示",MessageBoxButtons.OK,MessageBoxIcon.Information)
    Return
End If
cmd.CommandText = "Select * From {Users} Where [Name] = '" & UserName & "'"
dt = cmd.ExecuteReader
dr = dt.DataRows(0)
If e.Form.Controls("PassWord").Value = dr("Password") Then
    _UserName = UserName
    _UserGroup = dr("Group")
    e.Form.Close
Else
    Messagebox.show("密码错误!","提示",MessageBoxButtons.OK,MessageBoxIcon.Information)
End If
DataTables("信息录入").LoadFilter = " [检查人] = '" & _UserName & "'"
DataTables("信息录入").load()

这个就是在“登录窗口”中“登录”按钮的事件代码