asp.net MVC EF dynamic query

Entity FrameWork 4.1

public SearchMyThings( string a, string b, int c )
{
     var mywidgets = DBContext.DbSet<Widget>();
     

 if( !a.IsNullOrEmpty )
        mywidgets = mywidgets.Where( w => w.AProperty == a );

     if( !b.IsNullOrEmpty )
        mywidgets = mywidgets.Where( w => w.BProperty == b );

     if( c > 0 )
        mywidgets = mywidgets.Where( c => c.CProperty == c );

}