test.cshtml

@using TXTextControl.Web.MVC.DocumentViewer

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

	// build BasePath including access token in query string
	var sProtocol = (Context.Request.IsHttps) ? "https://" : "http://";
	var sBasePathURL = sProtocol + Context.Request.Host
			+ "?access_token=" + sAccessToken;
}

<div style="width: 800px; height: 600px;">

	@Html.TXTextControl().DocumentViewer(settings =>
	{
		settings.BasePath = sBasePathURL; // pass the base path
		settings.Dock = DocumentViewerSettings.DockStyle.Fill;
	}).Render()

</div>