Reading columns in a datagrid that is nested in a repeater

[Maziar Aflatoun]

Hi everyone,

I have a datagrid that I create inside a Repeater at runtime. I have
defined a checkbox beside each row so that users can select multiple rows.
<asp:datagrid id="dgProducts" HorizontalAlign="Center"
AutoGenerateColumns="false" CellPadding="2"
runat="server" >
......
<asp:TemplateColumn HeaderText="" HeaderStyle-Width="20">
<ItemStyle HorizontalAlign="Center"></ItemStyle>
<ItemTemplate>
<asp:CheckBox ID="cbxProduct" Runat="server"
AutoPostBack="False"></asp:CheckBox>
</ItemTemplate>
</asp:TemplateColumn>

Just below my datagrid I have a button (Add button). I want to read the
values of all the checkboxes in my dynamically created datagrid. But it
keeps complaining that

System.NullReferenceException: Object reference not set to an instance of an
object.
for that Line Response.Write...

This is the code
private void btnAddProducts_Click(object sender, System.EventArgs e)
{
DataGrid dgProducts = this.Page.FindControl("dgProducts") as DataGrid;
Response.Write("Rows: " + dgProducts.Items.Count);
}

Can someone please help me with this?

Thank you
Maz

 

[Michel de Becdelièvre]

wrong name FindControl("dgProducts") : name (and ids) must be reasonably
unique and are thus :
- prefixed by the name of the parent container.
- suffixed by a number

you will have to iterate through the object hierarchy looking for objects
whose id includes "cbxProduct"

 

[Maziar Aflatoun]

Isn't dgProducts unique? Can you please show me an example? (Prefixed by the
name of the parent container and suffixed by a number)? Is there an easier
way to do this?

Thanks
Maz.

 

[Guest]

Hi Maz,

No, it’s in the Repeater, so it’s not unique.
You should use repeater.Items[index].FindControl("dgProducts").

HTH

Elton Wang
(e-mail address removed)