[Solved] ASP.Net DataList Error: does not contain a definition for ItemDataBound and no extension method ItemDataBound accepting a first argument of type

I have record in my database with three Columns as shown below:

I tried to create a nested Repetear control in another repeater control to display data (with images for each option) in this manner using DataList control inside Repeater control

*The Option button inside is will be used to add more options (if required) to the question. When the Admin clicks on the “Add Option” button, it display a pop-up where admin will type option into a textbox and the option will be inserted into the database to be displayed inside the control.

I added ItemDataBound event to the repeater and I got this error:

CS1061:'_1' does not contain a definition for 'ItemDataBound' and no extension method 'ItemDataBound' accepting a first argument of type '_1' could be found

Please what should I do in this code below?

HTML

    <asp:Repeater ID="Repeater1" runat="server" OnItemDataBound="Repeater1_ItemDataBound">
        <ItemTemplate>
            <table>
                <tr>
                    <asp:Label ID="Lblone" runat="server" Text='<%# DataBinder.Eval(Container.DataItem, "BallotQuestion") %>'></asp:Label>
                    <br />
                    <asp:DataList ID="DataList1" runat="server">
                        <ItemTemplate>
                            <asp:Label ID="lbl" runat="server" Text='<%# DataBinder.Eval(Container.DataItem, "candidateName") %>'></asp:Label>
                            <asp:Label ID="Labl1" runat="server" Text='<%# DataBinder.Eval(Container.DataItem, "shortBIO") %>'></asp:Label>
                        </ItemTemplate>
                    </asp:DataList>
                     <asp:Button ID="Button1" runat="server" Text="Add Option" />
                </tr>
            </table>
        </ItemTemplate>
    </asp:Repeater>

C#

    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
           CreateDataTable();
        }
    }
    private void CreateDataTable()
    {
        using (SqlConnection con = new SqlConnection("Data Source = (LocalDB)\\MSSQLLocalDB;AttachDbFilename=|DataDirectory|\\BallotDB.mdf;Integrated Security = True;"))
        {
            using (SqlCommand _cmd = new SqlCommand("SELECT * FROM [Table]", con))
            {
                using (SqlDataAdapter da = new SqlDataAdapter(_cmd))
                {

                    con.Open();
                    DataSet ds = new DataSet();
                    da.Fill(ds);
                    Repeater1.DataSource = ds;
                    Repeater1.DataBind();
                    con.Close();
                }
            }
        }
    }
    protected void Repeater1_ItemDataBound(object sender, RepeaterItemEventArgs e)
    {
        if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
        {
            DataList DataList1 = (DataList)e.Item.FindControl("DataList1");
            DataList1.ItemDataBound += new DataListItemEventHandler(this.ItemDataBound);
            DataList.DataSource = CreateDataList();
            DataList1.DataBind();
        }
    }