how do add two pointers to display text in label

This is NOT possible with with C-like strings, i.e. if data1 is defined in this (or similar) way:

char data1[] = "foo";

Your best bet would be wrapping such pointers in a CString object, e.g.

CString text = data1;
text += "and" + data2;
Wnd->SetWindowText(text);