How to change control properties from within a function.

Assuming that myfunc() is a member of the same class as the button1_Click() event handler, you can just use the same code in your function as you would in your event handler:

void myfunc()
{
    this->label1->Text = L"Some New Text";
}

I'm hoping that I've understood your question correctly :)

-------------------

Ah, it seems I did misunderstand the question, sorry :)

You want to access a control in a specific class from a function that's not in the same class. In that case, the outside function (myfunc) needs to receive a reference to the label, so that it can access it (otherwise it would be very hard for the myfunc function to find an instance of label1)

Unfortunately my C++ is extremely rusty, so I'm not sure what the syntax is for passing references, but in C# I'd do the following:

void myfunc(Label lbl)
{
  lbl.Text = "Some New Text"; // In C++: lbl->Text = L"Some New Text";
}

And then calling it like this from inside the button1_Click event handler (the "caller"):

myfunc(this.label1);

So in order to get this to work, you'll need to figure out the correct syntax for the label1 argument in both the myfunc function and the caller.

I hope this is of more use...