Set value for joined table in MVC Razor

Source: stackoverflow.com --- Thursday, January 28, 2016
I'm trying to create a razor page for a Windows auth MVC app that tracks who created the record. The basic idea looks like this: public class User { public int Id {get;set;} public string NetworkId {get;set;} } public class Event { public int Id {get;set;} public int UserId {get;set;} public DateTime Created {get;set;} public virtual User User {get;set;} } On the Razor page, I'm trying to create a HiddenFor for to set the user ID , but I can't get it to post correctly. Setting the Created field works correctly ( @Html.HiddenFor(model => model.Created, new { Value = DateTime.Now }) ), but the UserId won't set. This doesn't work: @Html.HiddenFor(model => model.User.NetworkId, new { Value = User.Identity.Name }) This throws a null reference exception: @{ Model.User.NetworkId = User.Identity.Name; } @Html.HiddenFor(model => model.User.NetworkId) There has to be an easier way to do this, other than looking for the NetworkId on the table and pulling back the actual primary key. Any ideas? ...

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