ListSearchExtender: The ListSearchExtender control extends either a ListBox or Dropdown Listbox. This extender allows you  to provide search capabilities through large collection that are located in either of these control. It have only on main properties TargetControlID.

How we implement the Update Progress server control

 Step1: we use the following control on aspx page

<%--Using ScriptManager or ToolkitScriptManager according toolkit version--%>
<asp:ScriptManager ID="ScriptManager1"runat="server"></asp:ScriptManager>
<%-- add the ListSearchExtender and dropdownlistbox--%>
<cc1:ListSearchExtender ID="ListSearchExtender1" runat="server" TargetControlID="ListBox1">
<asp:ListBox ID="ListBox1" runat="server">

  Step3: Run the project



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