EdPitt

//include the jquery.blockui.js plugin on your page first

<script type="text/javascript">
        Page = Sys.WebForms.PageRequestManager.getInstance();
        Page.add_beginRequest(OnBeginRequest);
        Page.add_endRequest(endRequest);

        function OnBeginRequest(sender, args) {
            $.blockUI();
        }

DaveGreasley

/// <summary>
	/// A helper class for Umbraco 7+ to get the currently logged on back office user from a non-backoffice context.
	/// </summary>
	public static class BackofficeUserHelper
	{
		const string BackofficeIdentityKey = "UmbracoBackofficeIdentity";

		/// <summary>
		/// The <c>UmbracoBackOfficeIdentity</c> representing the currently logged on Back Office user
		/// </summary>