FindControl returns null in MasterPage
问题 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? 回答1: 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