An example uGoLive check

RobotsTxtCheck.cs

namespace Our.Umbraco.uGoLive.Checks
{
    [Check("8088E981-174C-4ABA-9867-AF219B4E0D9E", "Robots.txt", "Create a robots.txt file to block access to system folders", "SEO")]
    public class RobotsTxtCheck : AbstractCheck
    {
        public override bool CanRectify
        {
            get { return false; }
        }

        public override CheckResult Check()
        {
            if(!File.Exists(HttpContext.Current.Server.MapPath("~/robots.txt")))
                return new CheckResult { Status = CheckResultStatus.Failed, Message = "Robots.txt file not found." };

            return new CheckResult { Status = CheckResultStatus.Passed, Message = "Robots.txt file found." };
        }

        public override RectifyResult Rectify()
        {
            throw new NotImplementedException();
        }
    }
}