>I did try to convert that line in VB.NET but no converter is able to.

It is a VB.NET line. Works for me. Try this (modified to use Rob's 'OrderByDescending):

Module Module1

   public oParametersDataDictionaryField As New Collection()

    Sub Main()

    	ParameterAddDataDictionaryField("One", 5)
		ParameterAddDataDictionaryField("Two", "Hello")
		ParameterAddDataDictionaryField("Alpha", DateTime.Now)
		ParameterAddDataDictionaryField("Zebra", "Hello")

		Dim result = oParametersDataDictionaryField.OfType(Of Object())().OrderByDescending(Function(x) x(0))
	End Sub

  Private  Function ParameterAddDataDictionaryField(tcField As String, toValue As Object) As Boolean
		oParametersDataDictionaryField.Add(New Object(4) {tcField, toValue, "", "", 0})
		Return True
	End Function
End Module