Class setup

 

Here is implementation how it should be used

public class ExamResultsFormViewModel
{
    public PreliminaryInformationViewModel PreliminaryInformation { get; set; }
    public string MemberID { get; set; }
    public string MemberName { get; set; }
    public int PatientID { get; set; }
    public string ConfirmationID { get; set; }
    public bool IsEditable { get; set; }
    #region Select Lists
    public SelectList ProviderOptions { get; set; }
    #endregion
}

public class PreliminaryInformationViewModel
{
    public string ProviderName { get; set; }
    public string ProviderID { get; set; }
    public string ServiceLocation { get; set; }
}

 

By default the mode binding does not understand the binding and therefore we need to help. To resolve nested class we need to use code as follows

 

 @Html.Partial("_YourPartialName", Model.Contact, new ViewDataDictionary()
 {
  TemplateInfo = new TemplateInfo()
  {
    HtmlFieldPrefix = "Contact"
  }
 })

Now following this pattern we can create the class.

 

And here is link to gist  :https://gist.github.com/cpoDesign/b9fd0b76fd15a0f57fee