AjaxControlToolkit.AjaxFileUpload.UploadRequestProcessor.ParseRequest C# (CSharp) Method

            XhrType ParseRequest(out string fileId)
            {
                fileId = Request.QueryString["guid"];

                if(!string.IsNullOrEmpty(fileId)) {
                    if(Request.QueryString["poll"] == "1")
                        return XhrType.Poll;

                    if(Request.QueryString["cancel"] == "1")
                        return XhrType.Cancel;

                    if(Request.QueryString["done"] == "1")
                        return XhrType.Done;
                }

                if(Request.QueryString["complete"] == "1")
                    return XhrType.Complete;

                if(Request.QueryString["start"] == "1")
                    return XhrType.Start;

                return XhrType.None;
            }