FindControl returns null in MasterPage

Question

I have a nested DataList in MasterPage. I'm trying to Findcontrol, but it returns null for DataList2.

What I tried so far :

DataList DataList1 = Page.Master.FindControl("DataListMain") as DataList;

DataList DataList2 = DataList1.FindControl("DataListNested") as DataList;

How can I fix this?

I have solved the problem by changing the code and using Web user control rather than doing this on Masterpage. — Bengi Besçeli, Aug 02 '18 at 08:37

score 0 · Answer 1 · answered Aug 01 '18 at 14:19

0

DataList has items. So you need to locate the nested DataList by index.

DataList dl = ((DataList)Master.FindControl("DataListMain")).Items[i].FindControl("DataListNested") as DataList;

Note however that the contents of the Master Page are loaded AFTER the contents of the page using that master.

answered Aug 01 '18 at 14:19

VDWWD

You use variable i. Could you add the complete code? – Bengi Besçeli Aug 01 '18 at 14:27
This is the complete code. `i` is just the index number of the item in `DataListMain` holding the nested datalist – VDWWD Aug 01 '18 at 14:32
So should I use foreach? – Bengi Besçeli Aug 01 '18 at 14:41
Depends if you want to access all the nested `DataListNested` or just one. If you want all then loop the items in `DataListMain`. – VDWWD Aug 01 '18 at 14:43
`foreach (DataListItem item in ((DataList)Master.FindControl("DataListMain")).Items)` – VDWWD Aug 01 '18 at 14:45
I have a single nested datalist and cannot access it. – Bengi Besçeli Aug 01 '18 at 15:18
each itemtemplate of the parent datalist can have it's own `DataListNested`. Therefore there can be more than one. Hence the index based access. – VDWWD Aug 01 '18 at 17:18

1 Answers1