如何从代码隐藏中调用void函数？

protected void Page_Load(object sender, EventArgs e)
{
    Button1.Click += new EventHandler(Button1_Click);
}

void Button1_Click(object sender, EventArgs e)
{
    // 函数逻辑
}

public delegate void MyDelegate();

MyDelegate myDelegate = new MyDelegate(MyFunction);
myDelegate();

void MyFunction()
{
    // 函数逻辑
}

button1.Click += (sender, e) => MyFunction();

void MyFunction()
{
    // 函数逻辑
}

Expression<Action> expression = () => MyFunction();
expression.Compile()();

void MyFunction()
{
    // 函数逻辑
}