ModelState.AddModelError is not being displayed inside my view

Question

I have the following view,, which create 10 ajax.beginform ,, But the problem that i am facing is that incase an error occurs during the creation of the object then the ModelState.AddModelError will not be shown on the view although i have set the @Html.ValidationSummary(true) The view looks as follow

@model Medical.Models.VisitLabResult  @for (int item = 0; item < 10; item++) {     <tr id = @item>     @using (Ajax.BeginForm("CreateAll", "VisitLabResult", new AjaxOptions     {         HttpMethod = "Post",         UpdateTargetId = item.ToString() + "td",         InsertionMode = InsertionMode.Replace,         LoadingElementId = "progress2",         OnSuccess = string.Format(             "disableform({0})",             Json.Encode(item)),     }))     {           @Html.ValidationSummary(true)          @Html.AntiForgeryToken()         <td>             @Html.DropDownList("LabTestID", String.Empty)             @Html.ValidationMessageFor(model => model.LabTestID)         </td>         <td>             @Html.EditorFor(model => model.Result)             @Html.ValidationMessageFor(model => model.Result)         </td>          <td>             @Html.EditorFor(model => model.DateTaken)             @Html.ValidationMessageFor(model => model.DateTaken)         </td>          <td>             @Html.EditorFor(model => model.Comment)             @Html.ValidationMessageFor(model => model.Comment)         </td>          <td>             <input type="submit" value="Create" />         </td>          <td id = @(item.ToString() + "td")>         </td>     }     </tr>     } </table> 

And my action method which defines the ModelState.AddModelError looks as follow:-

[HttpPost] [ValidateAntiForgeryToken] public ActionResult CreateAll(VisitLabResult vlr, int visitid = 28) {     try     {         if (ModelState.IsValid)         {             var v = repository.GetVisit(visitid);             if (!(v.EligableToStart(User.Identity.Name))){                  return View("NotFound");              }             vlr.VisitID = visitid;             repository.AddVisitLabResult(vlr);             repository.Save();              return Content("Addedd Succsfully");         }     }     catch (DbUpdateException)     {         JsonRequestBehavior.AllowGet);         ModelState.AddModelError(string.Empty, "The Same test Type might have been already created,, go back to the Visit page to see the avilalbe Lab Tests");     } } 

So how i can show the ModelState.AddModelError on my view.

Answer 1

I would urge you to change your try{ } catch(){ }

And first check if there exists a visit for the given id and if so simply returns the model with the added model error

    if (visitExists)     {          ModelState.AddModelError("CustomError", "The Same test Type might have been already created,, go back to the Visit page to see the avilalbe Lab Tests");          return View(vlr);         }     //Other code here 

Change your AddModelError To

ModelState.AddModelError("CustomError", "The Same test Type might have been already created,, go back to the Visit page to see the avilalbe Lab Tests"); 

And in your view simply add a

@Html.ValidationMessage("CustomError") 

Then when you return your model the error will be shown where you have placed the @Html.ValidationMessage ...