ListControl added as child controls does remember selected items on postback

Question

User-825949172 posted

Hi

I am get very frustrated while added listcontrol inside my custom server control. Basically, these controls does not remember what items user selected when postback occurs.

Just to test this I have created following code. Checkboxlist remembers its items collection but for some bizzare reason does not remember checked items when postback occurs. Please can someone provide me solution or direct me to correct resource;

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Text;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace AspNetServerControls
{
	[ToolboxData("<{0}:TestingViewStates runat=server></{0}:TestingViewStates>")]
	public class TestingViewStates : WebControl
	{
		protected override void CreateChildControls()
		{
			CheckBoxList chkList = new CheckBoxList();
			chkList.EnableViewState = true;
			Controls.Add(chkList);

			if (chkList.Items.Count == 0)
			{
				List<string> items = new List<string>();
				items.Add("London");
				items.Add("New York");
				items.Add("Paris");

				chkList.DataSource = items;
				chkList.DataBind();
			}
			
			base.CreateChildControls();
		}
	}
}