MVC3 Drop Down List Control does not keep State, Why?

Question

I have a drop down list control on a partial view and after posting the form the state of the drop down list control is not maintained

Here is the partial view cshtml co

Answer 1

The following code creates the view model for your next partial view:

TestCriteriaConsolidated combined = new TestCriteriaConsolidated();
combined.testCriteriaResults = test;

You need to set the year on this model:

combined.testCriteria.Year = Request.Form["testCriteria.Year"];

Answer 2

combined.testCriteria.Year needs to get set with the form value you posted

Try this

[HttpPost]
    public ActionResult Results(TestCriteriaConsolidated form)
    {
        List<TestCriteriaResults> test = new List<TestCriteriaResults>();
        test.Add(new TestCriteriaResults { Value1 = "one", Value2 = "one", Value3 = "three", Value4 = "Four" });
        test.Add(new TestCriteriaResults { Value1 = "one", Value2 = "two", Value3 = "three", Value4 = "four" });
        test.Add(new TestCriteriaResults { Value1 = "one", Value2 = "two", Value3 = "three", Value4 = "four" });
        test.Add(new TestCriteriaResults { Value1 = "one", Value2 = "two", Value3 = "three", Value4 = "four" });
        test.Add(new TestCriteriaResults { Value1 = "one", Value2 = "two", Value3 = "three", Value4 = "four" });

        TestCriteria criteria = new TestCriteria() { Year = form.testCriteria.Year };

        TestCriteriaConsolidated combined = new TestCriteriaConsolidated
                                                {
                                                    testCriteriaResults = test,
                                                    testCriteria = criteria
                                                };
        return View(combined);
    }

    public ActionResult Results() 
    { 
        return View(new TestCriteriaConsolidated());
    }