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using(var db=new YourDataCotext ())
{
var q= db.B.Single(b=>b.id==1);
q.a1=9;
var _a=db.A.Single(x=>x.Id==q.AId)
_a.update=DateTime.Now;
db.SaveChanges();
}
using(var db=new YourDataCotext ())
{
var q= db.B.Single(b=>b.id==1);
q.a1=9;
q.A.update=DateTime.Now;
db.SaveChanges();
}