Reference a repeater within a gridview on item databound - asp.net

Question

I've got an asp:DataGrid which has an asp:Gridview within it and this has many nested asp:Repeater's within that and i'm trying to reference the nested repeater from within my OnItemDataBound function
My code is similar to this
<asp:Datagrid runat="server" id="DataGrid1" OnItemDataBound="ItemDB" AutoGenerateColumns="false" Gridlines="None">
<Columns>
<asp:TemplateColumn HeaderText="">
<ItemTemplate>
<asp:GridView id="GridView1" runat="server" AutoGenerateColumns="false">
<Columns>
<asp:TemplateField>
<ItemTemplate>
<asp:Repeater id="Repeater1" runat="server">
<ItemTemplate>
<p>Test</p>
</ItemTemplate>
</asp:Repeater>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
</ItemTemplate>
</asp:TemplateColumn>
</Columns>
</asp:Datagrid>
bit complicated but that's kinda what i'm working with.
In my ItemDB command I have this
Sub ItemDB(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.DataGridItemEventArgs)
Dim drv As DataRowView = CType(e.Item.DataItem, DataRowView)
If e.Item.ItemType = ListItemType.Item Or e.Item.ItemType = ListItemType.AlternatingItem Then
If CType(e.Item.FindControl("GridView1"), GridView).Visible = True Then
CType(e.Item.FindControl("Repeater"), GridView).Visible = True
End If
End If
End Sub
but i get the error
Object reference not set to an instance of an object
and i'm guessing it's because i am referencing a Repeater within a GridView
Any ideas how to reference this properly?
This code may not be the simplest way of doing this but i've taken over someone else's work and need a quick fix before re-coding it all
Thanks in advance

Answer 1

You'll have to find the Gridview in the template and then register the event for it's RowDataBound, and the find the repeater in the event handler. You should use the OnItemCreated Event to register the OnItemDataBound events, but the easiest would be to indicate the methods in your .aspx:
<asp:GridView id="GridView1" runat="server" AutoGenerateColumns="false" onrowdatabound="GridView1_RowDataBound">
<Columns>
<asp:TemplateField>
<ItemTemplate>
<asp:Repeater id="Repeater1" runat=""server"
onitemdatabound="Repeater1_ItemDataBound">
<ItemTemplate>
<p>Test</p>
</ItemTemplate>
</asp:Repeater>
</ItemTemplate>
</asp:TemplateField>
</Columns>
</asp:GridView>
and in your code behind:
protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
//you could find the repeater in the gridview's itemtemplate here
// to the BulletedList
if (e.Row.RowType == DataControlRowType.DataRow)
{
Repeater rpt = (Repeater)e.Row.FindControl("Repeater1");
rpt.Visible = false;
}
}
protected void Repeater1_ItemDataBound(object sender, RepeaterItemEventArgs e)
{
//you could find controls in the repeater's itemtemplate here.
}