Nested repeater with Checkbox list using asp.net - asp.net

Question

I am trying to do a nested repeater control with check box inside. Basically, what i want is
categorize the checkboxes like,
Group 1
Item 1
Item 2
Group 2
Item 3
Item 4
Group 3
Item 5
Item 6
The problem I am facing is, I getting the error :
Error 1 : 'DataRowView' is not declared. It may be inaccessible due to its protection level.
Error 2 : Name 'DataRowView' is not declared.
ASPX :
<asp:Repeater ID="rp_Groups" runat="server" OnItemDataBound="rp_Groups_ItemDataBound" >
<ItemTemplate>
<ul>
<asp:CheckBox runat="server" ID="chk_Group" Text='<%# Eval("category_type") %>' Value='<%# Eval("service_type_category_id") %>' onclick="OnGroupClick" />
<p class="nested">
<asp:CheckBoxList runat="server" ID="chk_Items" DataValueField="ServiceTypeID" DataTextField="Name"
DataSource='<%# ((DataRowView)Container.DataItem).CreateChildView("FK_esnServiceType_Service_Type_Categorization") %>' ></asp:CheckBoxList>
</p>
</ul>
</ItemTemplate>
</asp:Repeater>
Codebehind:
Public Sub Fill()
Dim dtServiceCategory As DataTable = ServiceTypeModel.GetService_Categories()
Dim dtServiceType As DataTable = ServiceTypeModel.Search("", True)
rp_Groups.DataSource = dtServiceCategory
rp_Groups.DataBind()
Dim ds As New DataSet()
ds.Tables.Add(dtServiceCategory)
ds.Tables.Add(dtServiceType)
Dim relation As New DataRelation("FK_esnServiceType_Service_Type_Categorization", ds.Tables("dtServiceCategory").Columns("service_type_category_id"), ds.Tables("dtServiceType").Columns("CategorizationID"), False)
ds.Relations.Add(relation)
relation.Nested = True
End Sub
Protected Sub rp_Groups_ItemDataBound(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.RepeaterItemEventArgs) Handles rp_Groups.ItemDataBound
Dim chklist As CheckBoxList = DirectCast(e.Item.FindControl("chk_Items"), CheckBoxList)
If chklist IsNot Nothing Then
chklist.DataSource = DirectCast(e.Item.DataItem, DataRowView).CreateChildView("FK_esnServiceType_Service_Type_Categorization")
chklist.DataBind()
End If
End Sub
What am i missing ?

Answer 1

You should check which itemtype is being fired on the ItemDataBound event, this may or may not be the problem, as you don't have a header and footer template, however it is still good practice.
Protected Sub rp_Groups_ItemDataBound(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.RepeaterItemEventArgs) Handles rp_Groups.ItemDataBound
If e.Item.ItemType = ListItemType.Item OrElse e.Item.ItemType = ListItemType.AlternatingItem Then
Dim chklist As CheckBoxList = DirectCast(e.Item.FindControl("chk_Items"), CheckBoxList)
If chklist IsNot Nothing Then
chklist.DataSource = DirectCast(e.Item.DataItem, DataRowView).CreateChildView("FK_esnServiceType_Service_Type_Categorization")
chklist.DataBind()
End If
End If
End Sub
EDIT
I've just noticed that you are adding the relation after you have already binded the repeater's datasource. Try moving the .databind after the relation has been added.
EDIT 2
OK can you try this. Add the datatables to the dataset and set the repeaters datasource to: ds.Tables(0)
Public Sub Fill()
Dim ds As New DataSet()
Dim dtServiceCategory As DataTable = ServiceTypeModel.GetService_Categories()
Dim dtServiceType As DataTable = ServiceTypeModel.Search("", True)
ds.Tables.Add(dtServiceCategory)
ds.Tables.Add(dtServiceType)
Dim relation As New DataRelation("FK_esnServiceType_Service_Type_Categorization", ds.Tables("dtServiceCategory").Columns("service_type_category_id"), ds.Tables("dtServiceType").Columns("CategorizationID"), False)
relation.Nested = True
ds.Relations.Add(relation)
rp_Groups.DataSource = ds.Tables(0)
rp_Groups.DataBind()
End Sub

Answer 2

Ensure that you have imported namespace System.Data
Try to add
<%# Import Namespace="System.Data" %>
to your ASPX file.
As another option you can import namespaces globally, not only in one page:
http://msmvps.com/blogs/simpleman/archive/2006/01/11/80804.aspx