Pausing Data_Arrival event in Winsock

I can´t pause a transfer file using my client ftp project.
It works fine when it goes from the beginning straight to the end.
In MSDN i found this remark to DATA_ARRIVAL event of Winsock control:

"This event will not occur if you do not retrieve all the data in one GetData call."

But its is not true. Even if i don't use the GetData method, the Data_arrival event occurs.

How can i pause transfer between Server and my application, without closing de data conection and starting it again ?