How to set radio button active manually (by code)?

I have 2 radio button say r1 and r2.grouped together and made r1 group as true from property. I have made bool variable(vr) and attached with these radio button(DDX).

Now from code i wrote vr =1 then updatedata(TRUE). but from ui it is still showing r1 radio button active, inste开发者_如何学编程ad of r2. how to make radio r2 active by changing vr?

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UpdateData(TRUE) is to update the variables with the controls data. You want to update the controls from the variables, so you must use UpdateData(FALSE).

Note: I always add the following defines to stdafx.h so I won't forget:

// to use with UpdateData
#define TOWINDOW FALSE
#define TODATA TRUE

and then I just use UpdateData(TOWINDOW) or UpdateData(TODATA).