asp.net 动态添加多个用户控件

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Web; 
using System.Web.UI; 
using System.Web.UI.WebControls; 
namespace xuyuanwang.myControl 
{ 
public partial class Lablexuyuan : System.Web.UI.UserControl 
{ 
string a = "ok"; 
public string A 
{ 
set 
{ 
a = value; 
} 
get 
{ 
return a; 
} 
} 
protected void Page_Load(object sender, EventArgs e) 
{ 
Label1.Text = A; 
} 
} 
} 
 
aspx页面代码： 
代码 
 代码如下:

public partial class WebForm1 : System.Web.UI.Page 
{ 
protected void Page_Load(object sender, EventArgs e) 
{ 
} 
protected void Button1_Click(object sender, EventArgs e) 
{ 
myControl.Lablexuyuan ctl = (myControl.Lablexuyuan)Page.LoadControl("myControl/Lablexuyuan.ascx"); 
ctl.A = this.TextBox1.Text; 
ArrayList list = addl(ctl); 
for (int i = 0; i < list.Count; i++) 
{ 
myControl.Lablexuyuan ctl2 = (myControl.Lablexuyuan)list[i]; 
this.UpdatePanel1.ContentTemplateContainer.Controls.Add(ctl2); 
} 
} 
private System.Collections.ArrayList addl(myControl.Lablexuyuan l) 
{ 
System.Collections.ArrayList list = null; 
if (Session["a"] != null) 
{ 
list = (ArrayList)Session["a"]; 
} 
else 
{ 
list = new ArrayList(); 
} 
list.Add(l); 
Session["a"] = list; 
return list; 
}