Programmatically add an object of web user control into another user control

Question

i have a web form in to which i load a web user control(A)

an when a button on control A is clicked it loads an array of another web user control named as infobox

when i add the user control in to control collection of web user control A it does not show.

below is the code: on button click of control A

foreach (Categories category in CategoriesDataList)
            {
                InfoBox ib = new InfoBox();
                ib.LiteralName = category.Category_Name;
                span_tempList.Controls.Add(ib);
                ib = null;           
            }   



span_tempList is a `<span>` tag with `runat=server`

below i HTML and cs Code for InfoBox Control

 public partial class InfoBox : System.Web.UI.UserControl
    {
        protected global::System.Web.UI.WebControls.Label ltrlName = new System.Web.UI.WebControls.Label();

        protected void Page_Load(object sender, EventArgs e)
        {

        }

        public InfoBox()
        {

        }

        public string LiteralName
        {
            get { return ltrlName.Text; }
            set { ltrlName.Text = value; }
        }

    }

--HTML--

<div style="width:10%;float:left;">
        <asp:Label ID="ltrlName" runat="server" Text="Label"></asp:Label>
    </div>
    <div style="width:20%;float:left;">
        <asp:Image ID="imgPicture" runat="server" ImageUrl="" />
    </div>
    <div style="width:70%;float:right;">

    </div>

also tried to add controls to page doesn't works

Have you checked to see if the IsPostBack property of the page in the Page constructor true or false? — Robbie Tapping
– Robbie Tapping, Commented Jan 5, 2012 at 13:26

Tim Schmelter · Accepted Answer · 2012-01-06 07:51:54Z

3

You should not create an instance of a UserControl via constructor but by using LoadControl if you want to add it to the page's control-collection.

InfoBox ib = (InfoBox)LoadControl("InfoBox.ascx");

Also, why are you setting the control to null? It will be disposed automatically at the end of the page-lifecycle.

edited Jan 6, 2012 at 7:51

answered Jan 5, 2012 at 13:26

Tim Schmelter

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1 Comment

RohitWagh Over a year ago

Thanks For the help. it helped me and was able to load control programatically.. thanks but "InfoBox.ascx.cs" gave me error it was only .ascx file path LoadControl was asking for.

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