private readonly LContext _context; //to take data from db


private static Channel<string> s_channel = Channel.CreateUnbounded<string>();

        public string TakeFromDBMethod()
        {
            string DBvalue= _context.Logs.OrderByDescending(s => s.OccurTime).FirstOrDefault().Flag.ToString();//Wanna take Flag column from added rows

            return DBvalue;
        }

        public async Task<ChannelReader<string>> StreamMessage()
        {

            await s_channel.Writer.WriteAsync(DBvalue());

            return s_channel.Reader;
        }
        public async Task UpdateMessage(string message)
        {
            await s_channel.Writer.WriteAsync(message);
        }

var connection = new signalR.HubConnectionBuilder()
    .withUrl("/chatHub")
    .build();
document.getElementById("streamButton").addEventListener("click", (event) => __awaiter(this, void 0, void 0, function* () {
    try {
        connection.stream("StreamMessage")
            .subscribe({
                next: (item) => {
                    var li = document.createElement("li");
                    li.textContent = item;
                    document.getElementById("messagesList").innerHTML = item;
                },
                complete: () => {
                    var li = document.createElement("li");
                    li.textContent = "Stream completed";
                    document.getElementById("messagesList").appendChild(li);
                },
                error: (err) => {
                    var li = document.createElement("li");
                    li.textContent = err;
                    document.getElementById("messagesList").appendChild(li);
                },
            });
    }

@page
<div class="container">
    <div class="row"> </div>
    <div class="row">
        <div class="col-6"> </div>
        <div class="col-6">
            <input type="button" id="streamButton" value="Start Streaming" />
        </div>
    </div>
    <div class="row">
        <div class="col-12">
            <hr />
        </div>
    </div>
    <div class="row">
        <div class="col-6"> </div>
        <div class="col-6">
            <ul id="messagesList"></ul>
        </div>
    </div>
</div>
<script src="~/lib/signalr/dist/browser/signalr.js"></script>
<script src="~/lib/signalr/dist/browser/signalr.min.js"></script>
<script src="~/js/Chat.js"></script>