[Serializable]
 public class Select2Item
 {
 public bool Selected { get; set; }

 public string Text { get; set; }

 public string Value { get; set; }

 public Select2Item() { }

 public Select2Item(string text, string value)
 {
  this.Text = text;
  this.Value = value;
 }

 public Select2Item(string text, string value, bool selected)
 {
  this.Text = text;
  this.Value = value;
  this.Selected = selected;
 }
 } 

 protected override void OnPreRender(EventArgs e)
 {
  if (this.Page != null)
  {
  StringBuilder sbb = new StringBuilder();
  sbb.Append(string.Format(STYLE_TEMPLATE, Page.ClientScript.GetWebResourceUrl(this.GetType(), "HandControl.Style.checklist.css")));
  sbb.Append(string.Format(SCRIPT_TEMPLATE, Page.ClientScript.GetWebResourceUrl(this.GetType(), "HandControl.Scripts.checklist.js")));

  bool hascss = false;
  LiteralControl lcc = new LiteralControl(sbb.ToString());
  lcc.ID = "lccheck";
  foreach (Control item in Page.Header.Controls)
  {
   if (item.ID == "lccheck")
   hascss = true;
  }
  if (!hascss)
   Page.Header.Controls.Add(lcc);
  }
  base.OnPreRender(e);
 } 

 protected override void Render(HtmlTextWriter writer)
 {
  if (Items.Count > 0)
  {
  writer.Write("<div id='div" + this.ClientID + "' class='c01-tag-div' mul='" + (Multiple == true ? "1" : "0") + "'>");
  if (Multiple == false)
   writer.Write("<input name='tb" + this.ClientID + "' type='hidden' value='" + Items[0].Value + "' />");
  else
   writer.Write("<input name='tb" + this.ClientID + "' type='hidden' />");
  bool first = true;
  foreach (var item in Items)
  {
   if (Multiple == false)
   {
   if (item.Selected && first)
   {
    writer.Write("<a title='" + item.Text + "' class='c01-tag-item c01-tag-select' val='" + item.Value + "' tag='Y'>" + item.Text + "</a>");
    first = false;
   }
   else
   {
    writer.Write("<a title='" + item.Text + "' class='c01-tag-item' val='" + item.Value + "' tag='N'>" + item.Text + "</a>");
   }
   }
   else
   {
   if (item.Selected)
    writer.Write("<a title='" + item.Text + "' class='c01-tag-item c01-tag-select' val='" + item.Value + "' tag='Y'>" + item.Text + "</a>");
   else
    writer.Write("<a title='" + item.Text + "' class='c01-tag-item' val='" + item.Value + "' tag='N'>" + item.Text + "</a>");
   }
  }
  writer.Write("</div>");
  }
 } 

 public List<Select2Item> GetSelected()
 {
  if (Page != null)
  {
  var values = Page.Request.Form["tb" + this.ClientID].Split(',');
  var res = Items.Where(t => values.Contains(t.Value)).ToList();
  foreach (var item in Items)
  {
   if (res.Contains(item))
   {
   item.Selected = true;
   }
   else
   {
   item.Selected = false;
   }
  }
  return res;
  }
  else
  {
  return null;
  }
 } 

 public string GetSelectValue()
 {
  if (Page != null)
  {
  return Page.Request.Form["tb" + this.ClientID];
  }
  return "";
 } 

 protected override object SaveViewState()
 {
  var valuestr = Page.Request.Form["tb" + this.ClientID];
  if (!string.IsNullOrEmpty(valuestr))
  {
  var values = valuestr.Split(',');
  var temp = Items.Where(t => values.Contains(t.Value)).ToList();
  foreach (var item in temp)
  {
   item.Selected = true;
  }
  }
  return new object[] { base.SaveViewState(), Items };
 }

 protected override void LoadViewState(object savedState)
 {
  object[] vState = (object[])savedState;
  if (vState[0] != null)
  base.LoadViewState(vState[0]);
  if (vState[1] != null)
  Items = (List<Select2Item>)vState[1];
 }