C# - MVC View Model Text Data Lost After The Post - Display Them In The Case Of Failed Validation?

Nov 12, 2010

I've got a view model that has some text properties. And I use Html.DisplayFor to display them on the screen. But those text data won't be post back, so in the case of failed validation, the returned view won't have those data. How do I handle this kind of situation?

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Data Of Text Box Is Lost After Partial Post Back?

Mar 18, 2011

I have used update panel and in that update panel I have kept ASP Table control in which I am creating rows dynamically which in turn contains 1 dropdown lists and 3 text boxes. My problem is that after partial postback text boxes and dropdown list are found but text property of text boxes is showing empty and dropdown list's selected value is set to the first record in that box. I have also stored entire table in session and retrieve it in(!isPostBack) condition at page_load event.

part of my .aspx page is as below


I want to add one row on every addRowTbn click event there by retaining previous rows.

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MVC :: How To Display Model Level Custom Data Annotation Validation Error

Nov 30, 2010

I am a MVC newbie & am lost in various ways validation can be implemented in my application.

I created a custom model-level data annotation validator attribute, but am unable to display its error message in the view. Basically, I have let's say 5 properties in the Entity class Job (model-level custom attribute called UniqueKeywords defined on it):

1) LoginID: value comes in the URL

2) Title: Required property level attribute defined on it

3) CatID1, CatID2, CatID3 - 3 categoryIDs - these are dropdowns in the view with same list of keywords in all 3.

I want to mandate that the values picked by the user in all 3 category dropdowns should be different.

With reference to the code pasted below, here is the explanation of what happens:

When I submit the form without specifying a title or picking anything from any of the 3 category dropdowns, the validation occurs for the property level Required attribute as well as model level uniquekeywords attribute, but the error is displayed only next to the required field "Title". I can confirm that the custom validation also works by filling in some text in the Title field & then re-posting the form...this re-displays the view, but the error message "Category cannot be duplicated" is not displayed.

Only relevant code sections are pasted below:

My Entity class code:


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Web Forms :: How To Update View Source Of Page In Case Of Required Field Validation Failure

Sep 16, 2009

I have an ASP.Net screen, which has got around 10 required field and regular expression validators.

If an user clicks submit on the screen, the validators fire based on the user's input. It display the error messages on the screen.

Now I have to update the view source of the page to pass these error messages received by the user. If I am not wrong, the view source of the page gets generated at the server on Page_Load. And because the validators fire at the browser and they do not give any response back to the server I can't pass these error messages into my view source?

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C# - Way To Display The Text In An Textbox As Upper Case

Sep 27, 2010

I need to DISPLAY the text in an asp textbox as upper case, regardless of whether the users caps lock is on or not - is there some property or method I can use?
I am converting the text using the .ToUpper method on submitting to the database anyway, but I have been asked to also DISPLAY it in upper case before that when first being typed.

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Read A Complex View Model On POST?

Jun 5, 2010

I have an user view model that has the following properties:

public User user;
public List<Language> Languages;

I send the above model to the view and use html helpers to build the form, so I end up with something like:

<form action="/Users/Edit/5" method="post"><input id="user_UserId" name="user.UserId" type="hidden" value="5" />
First Name
Last Name

Now, I try to read the POST in something that initially was something like :

[AcceptVerbs( HttpVerbs.Post )]

public ActionResult Edit( int UserId, FormCollection form ) {

and cannot get the user.UserId variable, user.FirstName variable etc.

what needs to be done to be able to read this kind of POST request. I'm kind of reluctant to modifying my ViewModel as it is very simple and easy to maintain as it is.

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Binding View Model From A Form Post With Inner Complex Types?

Apr 15, 2010


What I want to achieve is the ID of the property: item.Item.ID to be bound to the ID from the (route)URL. However I can't get it to work. I tried using [Bind()] attribute.

I fixed it now using a hidden field in the form like so:

<%= Html.HiddenFor(model => model.Item.ID)%>

However this feels a bit icky. I'd like to know if there is a better cleaner way of doing this?

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MVC :: Multiple Model Validation In Same View?

Jul 10, 2010

I have a Order view with 2 user controls in it.

The first user control in the view is just to validate the customer and get some more details about the customer. This control is having one text box (customer name) with the button. When the user clicks the button it should validate the customer name in the client side using data annotations of customer model. if validation success then it should use some bussiness logic to verify the customer and show the customer details on the form.

The 2nd user control in the view is to get the address of the customer by searching for the house no and the postcode. This control is having 2 text box with the button.

The first user control is based on the strongly typed customer entity

The 2nd user control is bsed on the strongly typed address entity

The view with both the user control is based on the strongly typed order entity.

The issue here is with the validation. I have the validation summary in the view and client sider validation is enabled. When i click the search button on the first user control the client validation starts and throws validation error messages because when i search for the customer at that point of time i will not have values to may of the customer related fields in the order view.

The same thing happen when i click the search button on the 2nd view. It will throw client side validation for other fields.

What i want to achive is that when the user click the search button on the user control 1 then the validation should happen only to the customer name field (both in client and server).

When the user click the search button on the 2 nd user control the the validation should happen only for houseno and the postcode both in client and the server.

When the user clicks the save button on the order view all the fields in the form even the controls usere input fields should get validated. How to achive this in mvc?

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Repopulate The View Model In MVC 2 After A Validation Error?

Mar 15, 2010

I'm using ASP.NET MVC 2 and here's the issue. My View Model looks something like this. It includes some fields which are edited by the user and others which are used for display purposes. Here's a simple version

public class MyModel
public decimal Price { get; set; } // for view purpose only
[Required(ErrorMessage="Name Required")]


But doing this, I get an error on UpdateModel(rec): The model of type 'MyModel' could not be updated.

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Forms Data Controls :: Search According To Id Or Case No Then View It In A Grid View?

Aug 19, 2010

i'm tring to search my table according to id number or the case number then view it in a gridviewbut it work for the first time then after it stop for error

Dim conn As New SqlConnection
conn.ConnectionString = "Data Source=.SQLEXPRESS;AttachDbFilename=C:Program FilesMicrosoft SQL ServerMSSQL10.SQLEXPRESSMSSQLDATATask.mdf;Integrated Security=True;Connect Timeout=30;User Instance=True"


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MVC :: Dropdownlist Validation Not Working For Complex View Model

Feb 3, 2011

I have a question regarding validation of drop-down list values. I have a view that is bound to a view model type called ReservationData.

This object contains a property CustomerVehicles of type List<VehicleData>. VehicleDatahas two int properties VehicleMakeId and VehicleModelId.

On my view I am trying to loop over the number of items in the CustomerVehicles collection and displaying two dropdowns for each, a vehicle make dropdown and a vehicle model dropdown usingDropDownListFor.

When I try to submit and validate I do not see any validation errors displayed on the screen.

Just in case you are wondering I have added a ValidationMessageFor for each dropdown as well. I am not sure if this is an issue with the structure of my view model and its complexity and how the controls need to be named or how the ids need to be set.

Here is the code for the looping over the collection:


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MVC :: Multiple Instances Of Same Partial (with Same View Model) Messes Up Validation?

Jan 27, 2011

This project I'm working on have this custom clientside JavaScript validation framework created for (which I cannot change) that show error messages/summary based on your data annotations and a "Validate" method in your ViewModel.

Like I said I'm not allowed to change this, so wont be able to go with suggestions doing that.

What the person that created this did not foresee, is that one might need put several partials of the same type and having the same view model (each in a form) on a view.

So I went ahead and did things the normal way (using Html.whateverFor<model => model.whatever) and wala!....the custom validation thing throws error messages for the specific form fields, next to each form in the view. I was suggested to create a "prefix" for each instance of the view model, and do something like this:

Change: <%: Html.HiddenFor(model => model.AccountNumber)%>

To: <%: Html.Hidden(Model.ElementPrefix + "AccountNumber", Model.AccountNumber)%>

Not to mention the tons of jquery selectors and all that I have to go change (and all my view inputs)

(I just hate having to find workarounds for this "custom" everything they created for this project)

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MVC :: Compound View Model Object Causing Remote Validation Failure?

Feb 12, 2011

I have used a pattern of compound view models for a few of the forms in this project. It works very well.

In this case I have a VendorAddress view model. I use Address(es) in a few places in this project so I made and Address view model object that I can re-use. Then I desided I want to do a very thorough checking of the state codes and zips so, I desided I would try to use remote validation and check the state and zip code aganst a stored set of tables in the database.

The problem is I am not getting values back to the remote action methods for the fields I'm asking for (in this case State and PostalCode). I believe this is because of the name mangleing that the MVC framework does for compound or sub types for id(s) for the inputs in this case it is making names like 'Address_Line1' and 'Address_State' and 'Address_PostalCode'.

Ultimately the question I have is, is there a way of turning off the pre-pended 'Address_' from the base view model object in a way that MVC framework can put it bak into the object after ther post of the form?


Then in the form after rendering it looks like this:


I get the remote call but there is nothing in the parameters "State" and "PostalCode", so the unobtrusive routines are firing but I think it does not know where to look for the data even though I have type something in the mensioned fields. As you can see in the rendered code the id="Address_State" and the data-val-remote-additionalfields="*.State,*.PostalCode"

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MVC :: How To Display Property Of Model On View

Aug 26, 2010

How can I show display property of Model on View.

public class Model
[DisplayName("First Name")]

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MVC :: How To Display An Image Property Of A Model In A View

Sep 11, 2009

this is my first post on this forum, and here it comes:I have a Model which has an image property:


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MVC :: Display Foreign Key-bound Property From Model View

Apr 17, 2010

but I am new with MVC and database-driven applications.

I hava a table with Cities (ID,Name) and one with Businesses(ID,CityID,Name). The later has a foreign key relationship with the first table.

I used a linq-to-SQL class to create my models.

My problem is that I need to access the City Name(not the ID) when displaying the Business Model View.

How can I do this? if from my controller I call the View passing the auto-generated Business Model, I only have access to the ID.

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MVC :: Display Changed Values In The View After POST?

Nov 27, 2009

I am trying do display the updated value in the View(in textbox and checkbox) after the submit button is clicked(POST). The values for textbox and checkbox areNOT getting updated only ViewData["Message"] is updated at every POST.

what am I doing wrong??? How do I display the updated values after every POST.

My View is as below:


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MVC :: "Post" The Model Variable In View To The Next Controller?

Jul 22, 2010

I'm displaying the values in ViewData.Model in a View (.aspx) -- After the user looks them over, when the user clicks the "Submit" button that I have in this view, I want the ViewData.Model passed to another controller, but I'm not sure how to do this.

Currently, my target controller/action looks like this:


The "ViewData.Model" variable in this View is of type: List<Sample>

How do I pass the ViewData.Model to the RegisterController / Samples (action) ?

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Forms Data Controls :: Display Text For Empty Grid View?

May 5, 2010

I'm trying to execute a query and display the result in grid view.Its working well...

However,I wish to display some simple text like"No tuples selected" making gridview visible to false if there are no rows selected for that query executed.Is there a way to do that?

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MVC :: Bind Text Box To Model Property Not Working On "post Back"?

Jan 22, 2010

i have a text box that i bind to my model data and it works fine. however when i submit my form in some cases i want to change the value that in the text box so some value i pull from the db. when i do this, it only works if the form was not submitted. is there something i am not aware of when it comes to rebinding a text box from the model in cases when the form was submited, instead of reloading the same value that the user entered into the text box?

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Should Data Annotations Be On The Model Or The View Model

Dec 15, 2010

I've been used to decorating data model classes with data annotation attributes, but the purist in me baulks slightly at including purely presentational attributes such as display format here. I am, however, quite happy to keep validation centric attributes here. One good reason I have to continue keeping all annotations etc. in the data model is that my view model aggregates data model classes, e.g.

my ViewModelBase.DetailItem<TEntity> property in the view model is just a reference to an entity class in my data model. If I wanted to move presentational annotations to the view model, I would have to quite radically revise my design to one where I duplicate data model properties in my view model and use an object mapping tool to populate view model objects based on data model objects.


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Display Text Returned From Json Post Call?

Mar 15, 2010

I have the following javascript:

$.post("/Authenticated/DeletePage/" + PageId);
showStatus("Page deleted...", 10000);

I would like to instead pass showStatus() text that is returned by the $.post() call, rather than hardcoded text. How do I do this?

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Model View Control Versu Model View Presenter

Jun 2, 2010

I have been reading about different model for development

model view control mvc

model view presenter MVP

Model view view model MVVM

i belive MVC has two big Advantage over webform 1) TDD 2) More control on HTML

MVP is bit variation in mvc model. rapid development as well as 1) TDD 2) More control on HTML (correct me if i m wrong) see the below link


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Forms Data Controls :: How To Get Data To Details View In This Case

Feb 14, 2011

I try to bind a detailsview to my SQL Server data base, but I dont know how to get specific field like this case. this is my C# code


this is my HTML code, in line 10 in wizard I can get "title" by using "<%# Eval("Title") %>" ,is that right? I want to get the same title but not in wizard


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MVC2 View Model For Multiple View Forms And Data

Aug 26, 2010

one thing that has been puzzling me since learning MVC2 is the following case scenario: I have a view which contains two latest news lists, a login form and a signup form. Every example I found on Views and View Models so far has a one-to-one example such as a simple login form etc. But how do I create a model that provides the properties and validation for a login and signup form and manages the data for the news lists. can I pass multiple models in the strongly typed view? When I created one model the form validation would fail as it expects all fields - login and signup to be filled. I am missing some advanced examples or information.

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MVC :: Access Model Validation Inside Custom Model Binder?

Sep 1, 2010

Is it possible, inside a Custom Model Binder, to fire "something" that "says" the value is invalid so it gets handled by validation part?

Basically, I am getting an exception when the value for the property is invalid.

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MVC :: Data Lost In Transition From View - Controller

Sep 28, 2010

MVC basics or looks like I am doing something terribly wrong, but have not slightly idea what is it? Want to delete user from MVC Framework's Built in Security Module. So first I define Delete() in AccountController:


and this works fine. Second: I added view (for delete) DeleteUser.aspx

<h3>Are you sure you want to delete this?</h3>
<div class="display-label">UserId</div>
<div class="display-field"><%= Html.Encode(Model.UserId) %></div>
<div class="display-label">UserName</div>
<div class="display-field"><%= Html.Encode(Model.UserName) %></div>
<div class="display-label">LoweredUserName</div>
<div class="display-field"><%= Html.Encode(Model.LoweredUserName) %></div>
.... etc
And this works fine.
And then finaly when I submit this values for delete, and run back to the Controller and DeleteUser:
public ActionResult DeleteUser(aspnet_Users inUser)

It is a problem. Not a single value from View are pased?? For example:

inUser.UserName is null,
inUser.UserId 00000000-0000-0000-0000-000000000000,
... etc.

All values form view are losted? Why and how this can be?

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How To Bind Post Data With A Model That Contains Multiple Models

Nov 4, 2010

I have a parent View that uses a few partial views. Each partial view has its own custom model. The parent View is a model containing each of the partial view's model. In other words this parent View model is NOT flat.

How do i get POST data to bind with the parent's model object? Do i have to write a custom model binder?

Update I'm not binding to a collection of objects of the same type (ie: a collection of uploaded files). I'm binding to object that contains multiple of objects. For example:


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MVC :: Retain Partial Data In Model Over The Post Backs?

Oct 12, 2010

I have recently started learning ASP.NET with MVC 2 Framework, I am facing difficulties in the following scenarios.In my MVC application I want to retain partial information in Model over post backs.Following is my scenario,

1. I initiate "Edit" of main record by clicking date hyperlink from left navigation.

2. Amend some data.

3. Save the record.

4. "Edit" sub record of the saved record by clicking another hyperlink from bottom left navigation panel.

The page is divided in to 6 tabs, the first 5 tabs shows the data for the main record and the 6th tab shows data of sub record. Wehn we "Edit@ sub record the previous 5 tabs doesn't have any changes noted, that means there is no harm in keeping their details intact in the main model. So is there a way to access model in the controller on hyper link click action so that I can only load the data for the clicked sub record (I am asking this, because the hyperlink click uses HTTP GET method so no model parameter passed in action method). If no, then how do I retain partial values in the Model over post backs?

Note that each tab data have been kept in individual models, and a main model has a collection member to hold all these individual models together.I thought as the model is binded with the view, it is too binded with controller. But it is allowing easily to access model in variable "Model" for the view but not for the controller.

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Forms Data Controls :: Set Width Of Gridview In Case Of Garbage Text Which Has No Space?

Feb 3, 2011

if we enter text without space in text box and then display it in gridview then it doesn't break in multiline and disturb all GUI. i try to set column width but it doesn't working.

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