test.cshtml

@using TXTextControl.Web.MVC

@{ 
    // use an access token (for example returned by OAuth)
    var sAccessToken = "821e2f35-86e3-4917-a963-b0c4228d1315";

    // build WebSocketURL including access token in query string
    var sProtocol = (Request.Url.Scheme == "https") ? "wss://" : "ws://";
    var sWebSocketURL = sProtocol + Request.Url.Authority +
      "/api/TXWebSocket?access_token=" + sAccessToken;
}

@Html.TXTextControl().TextControl(settings => {
    settings.WebSocketURL = sWebSocketURL; // pass built WebSocketURL
}).Render()