Is it safe to use the beta versions of Visual Studio?

By safe I mean, while developing any project in this studio, is it probable that it may cause some losses to my project? Or any other kind of risk?

> 
> Should I just use the studio 2008 and
>  wait for the stable version of Studio
>  2010?
> 
> 
> 

**Purpose of the question:** I am doing my graduation project in .NET framework (includes - C#, WPF etc.).So I don't want to put my project at any risk because of some issue regarding (beta) visual studio.Hence the question.