Add New line to multiline textbox

[Cha0sBG]

Ok i've tryed to google it but not the results i need and not the right language so i'm gonna ask it here:

How to add a new line to a multiline textbot control in Win32 Visual C++.

And for example how to add the text to that textbox: Example

char Buffer = "a little buffer";
char Buffer2 = GetDlgItemText(......);

SetDlgItemText(hWnd, TXT1, Buffer + Buffer2);

that seems to be an incorrect way and i can't seem to find the correct one >.<

Any help will be useful.