asp.net mvc 5 wont save foreign key

Question

Hello i want do save data with specific user id but am stack i don't know how to do it, i was told i could set my post method to insert data with current user id as a foreign key but i have no idea how to di it. so i have two tables aspNetUsers and Tutorial the relationship is one to may, a user can have multiple tutorials

 

Controller

[HttpPost]
[AllowAnonymous]
[ValidateAntiForgeryToken]
public ActionResult Create(Tutorial Tutorial, string UserId)
{
if (ModelState.IsValid)
{
db.Tutorials.Add(Tutorial);
db.SaveChanges();
return RedirectToAction("Index");
}
return View(Tutorial);
}

Tutorialmodel

[Table("Tutorial")]
 public class Tutorial
{
[Key]
 public int TutorialId { get; set; }
 public string Topic { get; set; }

[Required(ErrorMessage = "Course Name is required")]
[Display(Name = "Course Name")]
 public string CoursesName { get; set; }

[Required(ErrorMessage = "Discription is required")]
 public string Description { get; set; }

[AllowHtml]
 public string Content { get; set; }

[ForeignKey("User")]
 public string UserId { get; set; }

 public virtual ApplicationUser User { get; set; }

}

IdentityModels

public class ApplicationUser : IdentityUser
{

 public virtual ICollection Tutorials { get; set; }


 public async Task GenerateUserIdentityAsync(UserManager manager)
{
 // Note the authenticationType must match the one defined in CookieAuthenticationOptions.AuthenticationType
var userIdentity = await manager.CreateIdentityAsync(this, DefaultAuthenticationTypes.ApplicationCookie);
 // Add custom user claims here
 return userIdentity;
}
}

CreateView

@using (Html.BeginForm())
{
@Html.AntiForgeryToken()
class="form-horizontal">
Tutorial

@Html.ValidationSummary(true, "", new { @class = "text-danger" })
class="form-group">
@Html.LabelFor(model => model.Topic, htmlAttributes: new { @class = "control-label col-md-2" })
class="col-md-10">
@Html.EditorFor(model => model.Topic, new { htmlAttributes = new { @class = "form-control" } })
@Html.ValidationMessageFor(model => model.Topic, "", new { @class = "text-danger" })

  

  

class="form-group">  

@Html.LabelFor(model => model.CoursesName, htmlAttributes: new { @class = "control-label col-md-2" })  

class="col-md-10">  

@Html.EditorFor(model => model.CoursesName, new { htmlAttributes = new { @class = "form-control" } })  

@Html.ValidationMessageFor(model => model.CoursesName, "", new { @class = "text-danger" })  

  

  

class="form-group">  

@Html.LabelFor(model => model.Description, htmlAttributes: new { @class = "control-label col-md-2" })  

class="col-md-10">  

@Html.EditorFor(model => model.Description, new { htmlAttributes = new { @class = "form-control" } })  

@Html.ValidationMessageFor(model => model.Description, "", new { @class = "text-danger" })  

  

  

class="form-group">  

@Html.LabelFor(model => model.Content, htmlAttributes: new { @class = "control-label col-md-2" })  

class="col-md-10">  

@Html.EditorFor(model => model.Content, new { htmlAttributes = new { @class = "form-control" } })  

@Html.ValidationMessageFor(model => model.Content, "", new { @class = "text-danger" })  

  

  

@*@Html.HiddenFor(model => model.User.Id)*@  

@*class="form-group">  

@Html.LabelFor(model => model.UserId, "UserId", htmlAttributes: new { @class = "control-label col-md-2" })  

class="col-md-10">  

@Html.DropDownList("UserId", null, htmlAttributes: new { @class = "form-control" })  

@Html.ValidationMessageFor(model => model.UserId, "", new { @class = "text-danger" })  

  

*@  

class="form-group">  

class="col-md-offset-2 col-md-10">  

"submit" value="Create" class="btn btn-default" />  

  

  

  

}   

i would apreciate any help.