Starting an STAThread in C#

I am still kind of new to C#, and especially threading in C#. I am trying to start a function that requires a single threaded apartment (STAThread)

But I am not able to compile the following code:

The function looks as follows in a separate class called MyClass:

internal static string DoX(string n, string p)
        {
            // does some work here that requires STAThread
        }

I have tried the attribute [STAThread] on top of the function but that does not work.

So I am trying to create a new Thread as follows:

 Thread t = new Thread(new ThreadStart(MyClass.DoX));

but this will not compile (The best overloaded method has invalid arguments error). However the example online is very similar (example here) What am I doing wrong and how can I simply make a function run in a new STA thread?

Thanks