easy vc++ questions

Hi,
I am a VB programmer who is learning VC++.net. I want to know how to get the values from edit boxes on dialogs.

Using the wizard I have created a MFC, SDI application. I have created a dialog box and a subsequent class for the dialog. I then created a member variable connected by value to the edit box of type CString. This dialog box is shown when the user clicks an item on the menu.

What is the syntax of retrieving the value in the edit box when for example the user clicks ok on the dialog or setting it by code before the dialog is shown?

Is CString variables different from String variables?
What does Afx stand for as in "AfxMessageBox"?

Thanks,

Alex

Okay I have some of this working the problem was I wasnt calling the UpdateData function.

Am I right in thinking:
UpdateData(False) sends data from member variables to controls
UpdateData(true) sends data from controls to member variables?

Afx in case anyone is interested is apparently MFC's predecessor and stands for application frame work.

As I understand it CString is MFCs implementation of String and are basically the same except some MFC stuff expects arguments in the form of CString.

Alex