I am a total F# rookie (although I am pretty good with C#).

I was trying to access a discriminated union type defined in a F# class library in C#. My baby steps in writing it in F# went like this:

type discriminatedUnionType =

| StringValue of string

| IntValue of int

let setUnionValue param =

match param with

| StringValue param -> StringValue(param)

| IntValue param -> IntValue(param)

From C# I used it like so:

discriminatedUnionType du = setUnionValue(discriminatedUnionType.NewStringValue("some string value"));

With the returned 'du', I can check if the value set inside the union is a string or an int using:

du.IsStringValue or du.IsIntValue

but how do I access the actual value ("some string value") from the returned 'du' instance?

I must be missing something blindingly obvious here.