F# union types in C#

An other name for union types is discriminated unions.

I was interested what a union type looks and behaves in C#.

I build small demo applcation:

private void nudTest_ValueChanged(object sender, EventArgs e)
{
int x = Convert.ToInt32(nudTest.Value);

if(PsA.resultOfVote(x).IsYes())
{
lblResult.Text = "Yes";
}

if(PsA.resultOfVote(x).IsNo())
{
lblResult.Text = "No";
}

if(PsA.resultOfVote(x).IsMaybe())
{
lblResult.Text = PsA.resultOfVote(x).Maybe1.ToString();
}

}

The object created by F# looked like this:

I called the dll PsA.