Binding data from SQL server in to Bootstrap dropdown

void BindDrowpodown()
  {
      var list = new List<keyvaluepair><string,>>();
      list.Add(new KeyValuePair<string,>("http://www.google.com", "a"));
      list.Add(new KeyValuePair<string,>("http://www.google.com", "b"));
      list.Add(new KeyValuePair<string,>("http://www.google.com", "c"));

      string drowdownhtml = string.Empty;

      foreach (var element in list)
      {
          drowdownhtml += " <ul><li><a href=" + element.Key + ">" + element.Value + "</a></li></ul>";
      }

      lrtValues.Text = drowdownhtml;





  }</keyvaluepair>

<div class="dropdown">
                <button class="btn btn-primary dropdown-toggle" type="button" data-toggle="dropdown">
                    Dropdown Example
  <span class="caret"></span>
                </button>
                <ul class="dropdown-menu">
                    <asp:Literal ID="lrtValues" runat="server"></asp:Literal>
                </ul>
            </div>