GridView Paging inside a repeater - asp.net

Question

I have a gridview nested within a repeater, and I'm trying to enable paging on the gridview without much success.
The gridview databound is like this
<asp:repeater....>
<asp:gridview id="GridView1" Datasource='<%# LoadData(CInt(Eval("Id"))) %>'
OnPageIndexChanging="GridViewPageIndexChanging" AllowPaging="true"
PageSize="10" ............. </asp:GridView>
</asp:repeater>
In the code behind my LoadData method get a list of objects:
Public Function LoadData(ByVal Id As Integer) As IList(Of Client)
Dim ds As IList(Of Client) = client.GetClientById(Id)
Return ds
End Function
And the event handler is as follow:
Protected Sub GridViewPageIndexChanging(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewPageEventArgs)
sender.PageIndex = e.NewPageIndex
End Sub
My code doesn't change the page in the gridview, am I missing something ?
Any help is very much appreciated.

Answer 1

You have to call DataBind().
Dim grid as GridView = DirectCast(sender, GridView)
grid.PageIndex = e.NewPageIndex
grid.DataBind()
EDIT
Since I can't comment yet and creating another answer to an answer makes everything confusing, I'll just edit this one.
I'm afraid the Repeater is a wrong control to use for what you want. The problem stems from the fact that it does not preserve DataItem when GridView's page events fire. So the "id" gets evaluated into nothing and subsequently a zero. Btw, in C# you'd get a null exception.
I suggest you use the DataList instead:
<asp:DataList ID="DataList" runat="server" DataKeyField="id">
<ItemTemplate>
<asp:GridView ID="Grid" runat="server"
AllowPaging="true"
PageSize="2"
OnPageIndexChanging="Grid_PageIndexChanging"
DataSource='<%# GetData(DirectCast(DataList.DataKeys(DirectCast(Container, DataListItem).ItemIndex), Integer)) %>'
>
</asp:GridView>
<hr />
</ItemTemplate>
</asp:DataList>
With code behind:
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
If Not IsPostBack Then
DataList.DataSource = New Integer() {1, 2, 3, 4, 5}.Select(Function(x) New With {.id = x})
DataList.DataBind()
End If
End Sub
Protected Function GetData(ByVal id As Integer) As String()
Dim arr As String() = New String(4) {}
For i As Integer = 0 To arr.Length - 1
arr(i) = String.Format("id {0}; grid item {1}", id, i)
Next
Return arr
End Function
Protected Sub Grid_PageIndexChanging(ByVal sender As Object, ByVal e As GridViewPageEventArgs)
Dim grid As GridView = DirectCast(sender, GridView)
grid.PageIndex = e.NewPageIndex
grid.DataBind()
End Sub
This code works -- I tested. Although, personally I don't like using binding expressions.

Answer 2

I'm one step further ,
After I do the binding I got an exception on Eval.
I changed it in the datasource to <%#LoadData(DataBinder.Eval(Container.DataItem,"Id"))%>
I don't get the Eval exception anymore after the binding. However my grid still empty.
[update]
Ok I got it solved by keeping my Ids in hashtable and I rebind my gridview with the equivalent id from the hashtable.
It is all good now thanks everyone for your helps.

Answer 3

One thing I see if your markup. Your sample has the GridView directly within the Repeater control. You will need it within the ItemTemplate.
<asp:Repeater ID="rpt" runat="server" ...>
<ItemTemplate>
<asp:GridView id="gv1" runat="server" ...>
.
.
.
</asp:GridView>
</ItemTemplate>
</asp:Repeater>