I want to set my window's titlebar text to "the name of my program" and the opened file name:

Here are the variables:

char chosenfile[MAX_PATH];

That variable contains the name of the file opened.
Now I want to set the window's text to:

SetWindowText(hwnd, "Notepad" + chosenfile);

but that method does not work. What is the way to add two string and then set the text to that string?