Looping through a list using foreach - asp.net

Question

I have a project that requires me to populate User information along with their personal information.
So far, I was able to loop through a list of users and personal information, but I was not able to populate null values.
For example:
public List<UserDetailModel> UserInformation()
{
List<UserDetailModel> userdetails = new List<UserDetailModel>();
var user = _context.User.Where(x => x.Id > 0).ToList()
foreach(var item in user)
{
var personaldetails = _context.PersonalDetails.Where(x => item.PId == x.PId).ToList();
foreach (var item2 in personaldetails)
{
UserDetailModel userModel = new UserDetailModel();
userModel.UserId = item.UserId;
userModel.Name = item.UserName;
userModel.PhoneNumber = item.Number;
userModel.CreditCardNumber = item2.CCNumber;
userModel.SIN = item2.SinNumber;
userdetails.Add(userModel);
}
}
return userdetails;
}
What I'm expecting is:
"userId": 1,
"name": "john"
"phoneNUmber": 123-123-1234,
"creditCardNumber": 44455544445554545,
"sin": 9589898568
"userId": 1,
"name": "john"
"phoneNUmber": ,
"creditCardNumber": 44455544445554545,
"sin": 9589898568
"userId": 1,
"name": "john"
"phoneNUmber": 123-123-1234,
"creditCardNumber": ,
"sin": 9589898568
"userId": 1,
"name": "john"
"phoneNUmber": 123-123-1234,
"creditCardNumber": 44455544445554545,
"sin":
But what I'm getting with the above code is:
"userId": 1,
"name": "john"
"phoneNUmber": 123-123-1234,
"creditCardNumber": 44455544445554545,
"sin": 9589898568
How can I get all users along with their null values?

Answer 1

I guess the logic was not implemented correctly, Two loops not required seems,
Public List<UserDetailModel> UserInformation(){
List<UserDetailModel> userdetails = new List<UserDetailModel>();
var user = (from user in _context.User
join personal in _context.PersonalDetails
on user.PId equals personal.PId
Where user.Id>0).ToList();
foreach(var item in user)
{
UserDetailModel userModel = new UserDetailModel();
userModel.UserId = item.UserId;
userModel.Name = item.UserName;
userModel.PhoneNumber = item.Number;
userModel.CreditCardNumber = item2.CCNumber;
userModel.SIN = item2.SinNumber;
userdetails.Add(userModel);
}
So when personal details null it won't enter in the loop.