Trying to access a Repeater's HeaderTemplate controls from event fired in an ItemTemplate control

Cyrilix

I've got an ASP .NET webpage with the following structure:

<asp:DataGrid ID="aGrid">
<Columns>
asp:TemplateColumn
<ItemTemplate>
<asp:Repeater ID="aRepeater">
<HeaderTemplate>
<asp:Label ID="aLabel" Text='<%# DataBinder.Eval(Container.DataItem, "SomeColumn") %>'></asp:Label>
</HeaderTemplate>
<ItemTemplate>
<asp:TextBox ID="aTextBox" AutoPostBack="true" OnTextChanged="SomeEvent"></asp:TextBox>
</ItemTemplate>
</asp:Repeater>
</ItemTemplate>
</asp:TemplateColumn>
</Columns>
</asp:DataGrid>

The problem I'm having is that I would like to access the data that is stored in the label aLabel in the OnTextChanged event. What I'm doing to achieve this purpose is:

void SomeEvent(object sender, EventArgs e)
{
//Bind aRepeater to a certain data source in the ItemDataBound event of aGrid

//Get reference to aRepeater
//Parent gets you the RepeaterItem
//Parent.Parent gets you the Repeater
Repeater r = (sender as TextBox).Parent.Parent;

//Assert that r.DataSource != null

}

My assertion, however, fails, and even if I get aLabel.Text, it ends up being an empty string, since r.DataSource is null (despite the fact that in the ItemDataBound event of aGrid, I already bound the repeater to a data source). After some debugging, I noticed that Repeater r is not the same repeater as the one that I bound in the ItemDataBound event of aGrid, but how could that be? In the ItemDataBound event of aGrid, I do the following... //e is DataGridItemEventArgs object in ItemDataBound event e.Item.FindControl("aRepeater") as Repeater; ...which I assume should be equivalent to... (sender as TextBox).Parent.Parent; Sorry for the long post.