<table>
    <tr>
        <td>
            <input name=" txtUrl" type="text" id=" txtUrl" style="width:470px;" value="http://" />
        </td>
        <td>
            <input type="submit" name="btnDisplay" value="Go" id=" btnDisplay" />
        </td>
    </tr>
    <tr>
        <td colspan="2">
            <iframe id="ifBrowser" width="500px" height="500px"></iframe>
        </td>
    </tr>
</table>
 

 
protected Button btnDisplay = new Button();
protected TextBox txtUrl = new TextBox();
protected HtmlGenericControl ifBrowser = new HtmlGenericControl("iframe");
 
protected override void Render(HtmlTextWriter writer)
{
    writer.WriteFullBeginTag("table");
    writer.WriteFullBeginTag("tr");
    writer.WriteFullBeginTag("td");
    txtUrl.ID = "txtUrl";
    txtUrl.Text = "http://";
    txtUrl.Width = new Unit(470);
    txtUrl.RenderControl(writer);
    writer.WriteEndTag("td");
    writer.WriteFullBeginTag("td");
    btnDisplay.ID = "btnDisplay";
    btnDisplay.Text = "Go";
    btnDisplay.CommandName = "Click";
    btnDisplay.RenderControl(writer);
    writer.WriteEndTag("td");
    writer.WriteEndTag("tr");
    writer.WriteFullBeginTag("tr");
    writer.WriteBeginTag("td");
    writer.WriteAttribute("colspan", "2");
    writer.Write(">");
    ifBrowser.ID = "ifBrowser";
    ifBrowser.Attributes["width"] = "500px";
    ifBrowser.Attributes["height"] = "500px";
    ifBrowser.RenderControl(writer);
    writer.WriteEndTag("td");
    writer.WriteEndTag("tr");
    writer.WriteEndTag("table");
    base.Render(writer);
}
 

 
protected Button btnDisplay = new Button();
protected TextBox txtUrl = new TextBox();
protected HtmlGenericControl ifBrowser = new HtmlGenericControl("iframe");
 
protected override void CreateChildControls()
{
    HtmlTable mainTable = new HtmlTable();
    HtmlTableRow firstRow = new HtmlTableRow();
    HtmlTableRow secondRow = new HtmlTableRow();
    mainTable.Controls.Add(firstRow);
    mainTable.Controls.Add(secondRow);            
    HtmlTableCell firstRowFirstCell = new HtmlTableCell();
    txtUrl.ID = "txtUrl";
    txtUrl.Text = "http://";
    txtUrl.Width = new Unit(470);
    firstRowFirstCell.Controls.Add(txtUrl);
    HtmlTableCell firstRowSecondCell = new HtmlTableCell();
    btnDisplay.ID = "btnDisplay";
    btnDisplay.Text = "Go";
    btnDisplay.CommandName = "Click";
    firstRowSecondCell.Controls.Add(btnDisplay);
    firstRow.Controls.Add(firstRowFirstCell);
    firstRow.Controls.Add(firstRowSecondCell);
    HtmlTableCell secondRowfirstCell = new HtmlTableCell();
    ifBrowser.Attributes["width"] = "500px";
    ifBrowser.Attributes["height"] = "500px";
    ifBrowser.ID = "ifBrowser";
    secondRowfirstCell.Controls.Add(ifBrowser);
    secondRowfirstCell.ColSpan = 2;
    secondRow.Controls.Add(secondRowfirstCell);
    this.Controls.Add(mainTable);
    base.CreateChildControls();
}
 

 
public abstract class EmbeddedUserControl : CompositeControl
{
    protected Control UserControls;
 
    public T Control<T>(string id) where T : Control
    {
        this.EnsureChildControls();
        return (T)UserControls.FindControl(id);
    }
 
    protected override void CreateChildControls()
    {
        Assembly assembly = Assembly.GetExecutingAssembly();
        string name = this.GetType().Namespace + "." + this.GetType().Name + ".ascx";
 
        using (StreamReader sr = new StreamReader(assembly.GetManifestResourceStream(name)))
        {
            string content = sr.ReadToEnd();
            UserControls = (DesignMode) ? new LiteralControl(content) : Page.ParseControl(content);
        }
        this.Controls.Add(UserControls);
        base.CreateChildControls();
    }
}