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Passing Error Message from Controller to ViewBag

Crystal Rouse
Last Modified: 2019-01-27
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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Most Valuable Expert 2011
Top Expert 2015

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 RouseTask Lead


Can you please give an example of how to use it in the View?
Most Valuable Expert 2011
Top Expert 2015

That's line 1 of your first code snippet.
Crystal RouseTask Lead


I tried setting ViewBag.Message = "Test" in the controller.  I get nothing.  
I'm not doing something right here.
Most Valuable Expert 2011
Top Expert 2015
This one is on us!
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Crystal RouseTask Lead


Thank you so much for the sample code!

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