各位大侠，请帮忙分析一下以下代码，想在DropDownList中用递归法生成仿树型菜单

[lyjsd]

代码如下：

Sub myTree(ByVal ddl As DropDownList, ByVal tmpDataTable As DataTable, ByVal tmpFilterColumn As String, ByVal tmpFilterValue As String, Optional ByVal Space As String = "")
Dim tmpDataView As DataView = tmpDataTable.DefaultView
tmpDataView.RowFilter = tmpFilterColumn & "='" & tmpFilterValue & "'"
Response.Write(tmpFilterValue & " ")
Dim s As Integer = tmpDataView.Count
If s > 0 Then
For i As Integer = 0 To s - 1
ddl.Items.Add(New ListItem(Space & tmpDataView(i)("Name").ToString, tmpDataView(i)("ID").ToString))
myTree(ddl, tmpDataTable, tmpFilterColumn, tmpDataView(i)("ID").ToString, Space & "　")
Next
End If
End Sub

其中tmpDataTable用数据表，里面字段为ID，ParentID，Name
运行时老是出现“索引 1 不是非负数且小于总行数。”的错误
请各位高手帮忙分析一下，谢了！

[cloudgamer]

索引个数与参数个数不同,如下:11个索引,10个参数
string str=String.Format("INSERT INTO AD_CARVEOUT VALUES ('{0}','{1}','{2}','{3}','{4}','{5}','{6}','{7}','{8}','{9}','{10}')",this.UserName,this.Name,this.Sex,this.Age,this.Tel,this.Email,this.Area,this.Money,this.Trade,this.ProjectSummary);

diy520

[lyjsd]

经过尝试，将 Dim tmpDataView As DataView = tmpDataTable.DefaultView
改为 Dim tmpDataView As DataView = tmpDataTable.Copy.DefaultView
就可以了，各位大侠能不能给解释一下这是为什么？
还有没有其他方法生成类似的效果？