How can a formcollection be enumerated in ASP.NET MVC?

How can I enumerate through all the key/values of a FormCollection (system.web.mvc) in ASP.NET MVC?

From stackoverflow

• foreach(var key in Request.Form.AllKeys)
  {
     var value = Request.Form[key];
  }
  

• Here are 3 ways to do it specifically with a FormCollection object.

  public ActionResult SomeActionMethod(FormCollection formCollection)
  {
    foreach (var key in formCollection.AllKeys)
    {
      var value = formCollection[key];
    }
  
    foreach (var key in formCollection.Keys)
    {
      var value = formCollection[key.ToString()];
    }
  
    // Using the ValueProvider
    var valueProvider = formCollection.ToValueProvider();
    foreach (var key in valueProvider.Keys)
    {
      var value = valueProvider[key];
    }
  }
  

• foreach(KeyValuePair<string, ValueProviderResult> kvp in form.ToValueProvider())
  {
      string htmlControlName = kvp.Key;
      string htmlControlValue = kvp.Value.AttemptedValue;
  }
  

• And in VB.Net:

      Dim fv As KeyValuePair(Of String, ValueProviderResult)
      For Each fv In formValues.ToValueProvider
          Response.Write(fv.Key + ": " + fv.Value.AttemptedValue)
      Next
  

  DrydenMaker : I get "Expression is of type 'System.Web.Mvc.IValueProvider', which is not a collection type" when I try this. If I leave out the "ToValueProvider" it compiles, but I get "Specified cast is not valid."