I am using a multi line edit control. Here the event will be hadle using a timer and it is updated in every seconds. In each time,the same variable will be updating. So I want to display the variable in edit control and it should update in each time by down to down( not overwriting)

I have used
Code:
//.....bla...bla
CString dispVar;
m_list.SetWindowText[dispVar];
.

Here it is overwriting....
How can It Update?? Plz help...