below is my html file :
HTML Code:
<%@ Page Language="VB" AutoEventWireup="false" CodeFile="AutoComplete.aspx.vb" Inherits="AutoComplete" %>
<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="asp" %>

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>AutoComplete Example</title>
    <style type="text/css">
        /*AutoComplete flyout */
        .completionList {
            border: solid 1px #444444;
            margin: 0px;
            padding: 2px;
            height: 200px;
            overflow: auto;
            background-color: #FFFFFF;
        }
        .listItem {
            color: #1C1C1C;
        }
        .itemHighlighted {
            background-color: #ffc0c0;
        }
    </style>
    <script type="text/javascript">
        function onDataShown(sender, args) {
            sender._popupBehavior._element.style.zIndex = 1000001;
            sender._popupBehavior._element.style.left = "54px"; //set positions according to your requirement.
            sender._popupBehavior._element.style.top = "50px"; //set top position according to your requirement.
        }
    </script>
</head>
<body>
    <form id="form1" runat="server">
        <asp:ScriptManager ID="ScriptManager1" runat="server" />
        <div class="col-md-3">
            <div class="form-group fadeInUp position-relative">
                <asp:Label ID="Label3" runat="server" Text="Search By Company Name" class="control-label" Font-Bold="True"></asp:Label>
                <asp:TextBox ID="txtParty" runat="server" MaxLength="50" class="form-control" AutoPostBack="true"
                             Placeholder="Enter Company Name Here"></asp:TextBox>
                <asp:AutoCompleteExtender ID="AutoCompleteExtenderParty" runat="server" TargetControlID="txtParty"
                    MinimumPrefixLength="1"
                    EnableCaching="true" CompletionSetCount="10" CompletionInterval="1000"
                    ServiceMethod="GetParty" CompletionListCssClass="completionList" 
                    CompletionListHighlightedItemCssClass="itemHighlighted"
                    CompletionListItemCssClass="listItem" OnClientShown="onDataShown">
                </asp:AutoCompleteExtender>
            </div>
        </div>
    </form>
</body>
</html>
below is my Code :
Code:
Imports System.Web.Services
Imports System.Collections.Generic
Public Class AutoComplete
    Inherits System.Web.UI.Page

    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load

    End Sub
#Region "WebServices"

    <System.Web.Script.Services.ScriptMethod()>
    <System.Web.Services.WebMethod()>
    Public Shared Function GetParty(prefixText As String) As List(Of String)
        Dim ListOfCompanies As New List(Of String)()

        ' Sample data for demonstration
        For i As Integer = 1 To 10
            ListOfCompanies.Add("Company No. " & i.ToString())
        Next

        ' Uncomment and use the following code to fetch data from the database
        'Dim dt As New DataTable()
        'Dim constr As String = ConfigurationManager.ConnectionStrings("SqlConnectionString").ToString()
        'Using con As New SqlConnection(constr)
        '    Dim mWCmd As String = "SELECT CompanyName + ' | ' + Code as DName From SellerMaster WHERE CompanyName LIKE '%' + @mName + '%' ORDER BY CompanyName"
        '    Using cmd As New SqlCommand(mWCmd, con)
        '        cmd.Parameters.AddWithValue("@mName", prefixText)
        '        Dim adp As New SqlDataAdapter(cmd)
        '        adp.Fill(dt)
        '    End Using
        'End Using

        ' For demonstration, we are returning the sample data
        Return ListOfCompanies.Where(Function(c) c.StartsWith(prefixText, StringComparison.OrdinalIgnoreCase)).ToList()
    End Function

#End Region
End Class

what is happening is that the autocomplete list is returning some weird html data. attached is the image of the data being returned.
i just cant understand what is happening. i am using VS2022 
the same code is working fine in my VS2010 

pls. help me out 
thanks in advance
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