Hi @Peter_1985,
You can use AjaxControlToolkit through nuget package.
PM> NuGet\Install-Package AjaxControlToolkit -Version 20.1.0
After downloading the nuget package, you can use AjaxControlToolkit, the following is a simple code example.
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="WebForm823.WebForm1" %>
<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="cc1" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<cc1:ComboBox ID="cbCustomers" runat="server" AutoCompleteMode="SuggestAppend">
</cc1:ComboBox>
</div>
</form>
</body>
</html>
Best regards,
Lan Huang
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