// ham dang nhap
public String getusername(string id)
{
//st_GetidResult user = sdata.st_Getid(id).FirstOrDefault();
// var list=from q in db.Busers.Where(q=>q.USERID==id).FirstOrDefault();
GetIDUserResult user = db.GetIDUser(id).FirstOrDefault();
return(user.USERNAME);
}