MFC filing

Guyz
m working on my project to make a student management software in MFC and i need to do filing in it such as for login purposes and others. i used the method given in MSDN by microsoft but it generates error of "DEbug assertion failed". can anybody tell me how to do filing in MFC.
I heard MFC is full of bugs and litle documenation aoublt MFC problems is provided.
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