Sort a list by a function results

I want to sort a list by the results of functions that are contained in list items. How would go about doing that?

Here is an example. Let's say I have a following object:

Public Class MyListObject
    Public MyText1 As String
    Public MyText2 As String

    Public Function AddSuffix(ByVal MySuffix As String) As String
        Return Mytext1 & MySuffix
    End Function

End Class

(massively oversimplified for the sake of example)

After that I have a list of these objects:

Dim ResultList As New List(Of MyListObject)

Now, for example, to sort the list by the field MyText1 value, I used this:

ResultList = ResultList.OrderBy(Function(x) GetType(MyListObject).GetField("MyText1").GetValue(x)).ToList

(used reflection, so I can pass the field name as a string)

How can I sort this list by the function AddSuffix result and simultaneously pass the parameter MySuffix?

I imagine it would look something like this, but obviously this doesn't work

ResultList = ResultList.OrderBy(Function(x) GetType(MyListObject).GetField("AddSuffix(""_myCustomSuffix"")").GetValue(x)).ToList

PS. I realize, that in this example the function is pretty much meaningless. The actual code is much more complex and that function does return different sortable data for each list item.