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    <p>The default model binder will bind nested objects, you do not need to create your own model binder for this scenario.</p> <p>See: <a href="http://lostechies.com/jimmybogard/2011/09/07/building-forms-for-deep-view-model-graphs-in-asp-net-mvc/" rel="nofollow noreferrer">http://lostechies.com/jimmybogard/2011/09/07/building-forms-for-deep-view-model-graphs-in-asp-net-mvc/</a> and on SO <a href="https://stackoverflow.com/questions/3928120/defaultmodelbinder-not-binding-nested-model">DefaultModelBinder not binding nested model</a></p> <p>I suspect your problem is that your editor template is not returning anything via the post back so the nested object is null. The lines in your editor template:</p> <pre><code>@Html.DropDownListFor(Model =&gt; Model.Day, new List&lt;SelectListItem&gt;()) @Html.DropDownListFor(Model =&gt; Model.Month,new List&lt;SelectListItem&gt;()) @Html.DropDownListFor(Model =&gt; Model.Year, new List&lt;SelectListItem&gt;()) </code></pre> <p>Will give you three controls with empty drop downs, you will not be able to select anything from these drop downs as you have not supplied any values to them. If there is no value then they are not sent across the wire and cannot be model bound. To start of with change you editor template to:</p> <pre><code>@Html.TextBoxFor(Model =&gt; Model.Day) @Html.TextBoxFor(Model =&gt; Model.Month) @Html.TextBoxFor(Model =&gt; Model.Year) </code></pre> <p>This will allow you to actually enter some data onto to form. Once this is working you can then change the text boxes back to drop downs but you will need to supply values for the select lists, again, just creating new empty lists will not allow you to select any values.</p>
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    1. POReturn model from Partial View issue
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    1. USJohn Efford
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    1. COyou are right, but I have added the initial method to each dropdown, and I still got null. Before I click "submit", I have selected values from dropdown, however, once I clicked the submit button, the nest model "Calendar" would be assigned with "null". I have debugged the method "SetProperty" in DefaultBuilder, the value of object is always null
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    2. COTry inspecting the values of the items with Fiddler to see that the form values are actually being passed back to the server. Also what does the HTML look like for year, to be model bound it should have a name like DOB.Year, if it does not then it will not be bound.
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      1. USJohn Efford
    3. COfrom the Fiddler I can find the string below name=test&SpeciesID=2&BreedID=7&DOB.Day=23&DOB.Month=05&DOB.Year=2010
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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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