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Crystal Rouse
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Passing Error Message from Controller to ViewBag

Trying to figure out how to get a error message to the View Bag.  I have this in my View:

 @if (!string.IsNullOrEmpty(ViewBag.Message))
        <script type="text/javascript">
            title: "Error",
            text: "@ViewBag.Message",
            type: "error"
        }, function () {
            url = '@Url.Action("Index", "Requests")';
            window.location.href = url;

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My Controller has both a Get and a Post and I'm not sure how to get the error message to my View in the ViewBag.Message

        public ActionResult Index()

            ViewBag.Message = String.Empty;
            if (!String.IsNullOrEmpty(HttpContext.Session["Error"]?.ToString()))
                ViewBag.Message = HttpContext.Session["Error"].ToString();

            return View();

        public ActionResult Upload(HttpPostedFileBase file, string Name)
            var result = new { Success = "", Message = "" };
                    string pdfTemplate = "NewRequest.pdf";
                    byte[] pdfbytes = null;
                    BinaryReader rdr = new BinaryReader(file.InputStream);
                    pdfbytes = rdr.ReadBytes((int)file.ContentLength);
                    PdfReader reader = new PdfReader(pdfbytes);

                    string t = Name.Trim().Length == 0 ? null : Name;
                    var fields = reader.AcroFields.Fields;
                    var RequestID = reader.AcroFields.GetField("requestId");
                    var OpenDate = reader.AcroFields.GetField("openDate");
                    var Org = reader.AcroFields.GetField("organization");
                    var NeedDate = reader.AcroFields.GetField("needDate");
                    var FirstName = reader.AcroFields.GetField("firstName");
                    var LastName = reader.AcroFields.GetField("lastName");
                    tbl_Request request = new tbl_Request()
                        addedDate = DateTime.Now,
                        title = t,
                        requestId = RequestID,
                        openDate = Convert.ToDateTime(OpenDate),
                        organization = Org,
                        needDate = Convert.ToDateTime(NeedDate),
                        firstName = FirstName,
                        lastName = LastName


                catch (Exception ex)
                    Utility util = new Utility();
                    string error = util.innerExcep(ex);
                result = new { Success = "False", Message = error };
                return RedirectToAction("Index", "Upload", new { Result = result });

            return RedirectToAction("Index", "Requests", new { });

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C#* asp.net core mvc

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Last Comment
Crystal Rouse

8/22/2022 - Mon

ViewBag's data type is dynamic. That means you won't get any Intellisense on it. Other than that, just assign to it at whatever place in your controller is appropriate:

ViewBag.Message = "Uh-oh!!";

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Crystal Rouse

Can you please give an example of how to use it in the View?

That's line 1 of your first code snippet.
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William Peck
Crystal Rouse

I tried setting ViewBag.Message = "Test" in the controller.  I get nothing.  
I'm not doing something right here.

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Crystal Rouse

Thank you so much for the sample code!