ASP.NET MVC ajax.beginform : No parameterless constructor defined for this object

This can also be caused if your Model is using a SelectList, as this has no parameterless constructor:

public class MyViewModel
{
    public SelectList employeeList {get;set;}
}

 You'll need to refactor your model to do it a different way if this is the cause. So using an

IEnumerable<SelectListItem> and writing an extension method that

creates the drop down list with the different property definitions:

public class MyViewModel
{
    public IEnumerable<SelectListItem> employeeList { get; set; }
}

Perfect solution !