asp.net alert

    public static void alert(string message)
        {
            // Cleans the message to allow single quotation marks
            string cleanMessage = message.Replace("'", "\\'");
            string script = "<script type=\"text/javascript\">alert('" + cleanMessage + "');</script>";

            // Gets the executing web page
            Page page = HttpContext.Current.CurrentHandler as Page;

            // Checks if the handler is a Page and that the script isn't allready on the Page
            if (page != null && !page.ClientScript.IsClientScriptBlockRegistered("alert"))
            {
                page.ClientScript.RegisterClientScriptBlock(typeof(Alert), "alert", script);
            }
        }