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User table:
UserID (PK)

Company table:
CompanyID (PK)

entity framework model (v3.5) generated like :
public class User
  public string UserID;
  public string UserName;
  public Company company;

public class Company
   public string CompanyID;
   public string CompanyName;

You can see that there is no CompanyID field within User class.Then how to add new user to the database.

What I have tried:

Company c = new Company();
c.CompanyID = "...";

User u = new User();
... = c;


this will cause the EF to add a new company to the database first, which will end up with a duplicate key exception.

i tried to set up a "foreign key" property like versions of Entity Framework, but failed.
Updated 15-Oct-17 5:11am
Richard Deeming 13-Oct-17 8:32am    
Select the existing company from the database, and set the user's company to that.
855 13-Oct-17 9:32am    
is that the only way to do that? i already have the CompanyGUID, i don't want to connect database to get Company object. i don't need that
Richard Deeming 13-Oct-17 9:36am    
In more recent versions of Entity Framework, you can set up a "foreign key" property which would let you do that.
Entity Framework Relationships and Navigation Properties[^]

You'd need to see if you can do that in the version you're using, or if you can update to a more recent version.
855 13-Oct-17 9:52am    
I tried that it doesn't work.
Richard Deeming 13-Oct-17 9:54am    
Then update your question to show what you've tried, and what went wrong.

1 solution

first create a userview model same as user table in database then add that userview model to your database.
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