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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];

  }

}