Add radio button list items programmatically in asp.net

Add radio button list items programmatically in asp.net

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I have a radio button list whose items I need to add on Page_Load aspx code <asp:radioButtonList ID="radio1" runat="server" RepeatLayout="Flow" RepeatDirection="Horizontal"> </asp:radioButtonList> code behind protected void Page_Load(object sender, EventArgs e) { RadioButtonList radioList = (RadioButtonList)Page.FindControl("radio1"); radioList.Items.Add(new ListItem("Apple", "1")); } After the control reaches radioList.Items.Add I keep getting the Object reference not set to instance of an object error What am I doing wrong? c# asp.net share|improve this question asked Aug 12 '13 at 15:08 user544079 1,655134371

2   Is radio1 inside another asp.net control like a repeater or something like that? –  Claudio Redi Aug 12 '13 at 15:10 3   You can access the radioButtonList from code behind just calling the ID radio1.Items.Add(new ListItem("Apple", "1")); –  Fals Aug 12 '13 at 15:11  If its on same page why dont you directly write radio1.Items.Add? If not please edit your question. –  KuzgunAug 12 '13 at 15:12 @Claudio Redi: It is embedded inside a series of <div> elements –  user544079 Aug 12 '13 at 15:13 Yes, I can access it now using radio1.Items.Add –  user544079 Aug 12 '13 at 15:14 add a comment

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You don't need to to do a FindCOntrol. As you used the runat="server" attributes, just get the reference of your RadioList via its name "radio1" protected void Page_Load(object sender, EventArgs e) { radio1.Items.Add(new ListItem("Apple", "1")); } share|improve this answe