To upload a composite control child control event to the top example of a composite Control child control event upload to the top level

Control | Upload This is an example of selecting a province and then uploading the click event to the top level of the control in the page handling event. The bold part is the entire upload event process. Upload events (exposure events), exposure attributes, complex property management, style management, and so on are advanced topics for ASP.net server custom controls.
Using System;
Using System.Web;
Using System.Web.UI;
Using System.Data;
Using System.Data.SqlClient;
Using System.Web.UI.WebControls;
Using System.ComponentModel;
Using Yeno.EnBiz.News.Tools;

Namespace Yeno.EnBiz.News.Controls
{
<summary>
Summary description of the Researchctrl.
</summary>
[ToolBoxData ("<{0}:localctrl_province runat=server></{0}:localctrl_province>")]
public class Localctrl_province:system.web.ui.webcontrols.webcontrol,inamingcontainer
{
Private TableCell _province;
public event Commandeventhandler Clickprovince;

<summary>
Renders this control to the specified output parameter.
</summary>
<param name= "Output" > HTML writer to write </param>

protected override void Render (HtmlTextWriter writer)
{
AddAttributesToRender (writer);
Writer. AddAttribute (htmltextwriterattribute.cellpadding, "5", false);
Writer. AddAttribute (htmltextwriterattribute.cellspacing, "0", false);
Writer. AddAttribute (Htmltextwriterattribute.width, "100%", false);
Writer. RenderBeginTag (htmltextwritertag.table);

Writer. RenderBeginTag (htmltextwritertag.tr);
_province.rendercontrol (writer);
Writer. RenderEndTag ();

Writer. RenderEndTag ();
}
protected override void CreateChildControls ()
{
if (! Page.IsPostBack)
{
Controls.clear ();
Clearchildviewstate ();
}

_province=new TableCell ();

Createprovince ();


This. Controls.Add (_province);
}
protected void Createprovince ()
{
DataTable dtb= (DataTable) DATACALL.RUNSQLSP ("N_province_getall", Returntype.executereader);
for (int I=0;I&LT;DTB. rows.count;i++)
{
LinkButton lb=new LinkButton ();
Lb. Text=dtb. rows[i]["province"]. ToString (). Trim ();
Lb. Causesvalidation=false;
lb.commandargument=dtb.rows[i]["ID"]. ToString ();
Lb.command +=new Commandeventhandler (Province_command);
_province.controls.add (LB);
_province.controls.add (New LiteralControl (""));
}
DtB. Dispose ();
}
protected void Province_command (Object Sender,commandeventargs e)
{
Onclickprovince (e);
}
protected void Onclickprovince (CommandEventArgs e)
{
if (clickprovince!=null)
{
Clickprovince (this,e);
}
}
}
}