C#:如何访问表单类之外的按钮

public class MyForm : Form
{
    public Button myButton = new Button();
}

public class AnotherClass
{
    public void AccessButton()
    {
        MyForm myForm = new MyForm();
        myForm.myButton.PerformClick();
    }
}

using System.Runtime.CompilerServices;

[assembly: InternalsVisibleTo("AnotherAssembly")]

public class MyForm : Form
{
    internal Button myButton = new Button();
}

public class AnotherClass
{
    public void AccessButton()
    {
        MyForm myForm = new MyForm();
        myForm.myButton.PerformClick();
    }
}