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copied!<p>You have to assign the control to the form BEFORE setting it's properties.</p> <p>For example:</p> <pre><code>foreach (var car in cars){ Label lbl = new Label (); form1.Controls.Add(lbl); // Create and immediately assign lbl.Text = car.name; // now you can set some properties Image myImage = new Image (); form1.Controls.Add(myImage); // Ditto myImage.ImageUrl = car.imageURL; } </code></pre> <hr> <p><strong>UPDATE:</strong> </p> <p>I just created a brand new web application project with a page that only had a button on it; it worked as expected. I suggest you have something else going on. See below:</p> <pre><code><%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="WebApplication1._Default" %> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head runat="server"> <title></title> </head> <body> <form id="form1" runat="server"> <div> <asp:Button ID="Button1" runat="server" onclick="Button1_Click" Text="Button" /> </div> </form> </body> </html> </code></pre> <p>and the code behind:</p> <pre><code>namespace WebApplication1 { public partial class _Default : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { } protected void Button1_Click(object sender, EventArgs e) { for (Int32 i = 0; i < 10; i++) { Label lbl = new Label(); form1.Controls.Add(lbl); lbl.Text = "HAHAHAHAH"; } } } } </code></pre>

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