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 );

}