ASP.net MVC 5 Add data to multiple tables - asp.net-mvc

Question

Hi thank you all for assisting me. I am very new to ASP.net MVC and EF and am playing around to do some real project. I would really appreciate if someone could please guide me of how I can insert data into two tables in SQL with one to many relationships.
I have a requirement where I need to add multiple families to one behavior case.
tblCase [case_id] [case_no]
tblFamily [family_id] [first_name] [last_name] [case_id]
After following an online tutorial I am able to add multiple families but I can not get my head around how to:
Add a new case -> retrieve the last inserted case_id
Add all the families with the last inserted case_id in one submit button click.
My view looks like the following:
#model List<TestMVC.Family>
#{
ViewBag.Title = "BulkData";
Layout = "~/Views/Shared/_Layout.cshtml";
}
<style>
td {
padding: 5px;
}
</style>
<div style="width:700px; padding:5px; background-color:white;">
#using (Html.BeginForm("BulkData", "Save", FormMethod.Post))
{
#Html.AntiForgeryToken()
#Html.ValidationSummary(true)
if (ViewBag.Message != null)
{
<div style="border:solid 1px green">
#ViewBag.Message
</div>
}
<div id="dvCase">
<table>
<tr>
<td>Case Name</td>
<td><input type="text" value="" /></td>
</tr>
<tr>
<td>Case No</td>
<td><input type="text" value="" /></td>
</tr>
</table>
</div>
<div>Add New</div>
<table id="dataTable" border="0" cellpadding="0" cellspacing="0">
<tr>
<th>First Name</th>
<th>Last Name</th>
<th>Case Id</th>
<th></th>
</tr>
#if (Model != null && Model.Count > 0)
{
int j = 0;
foreach (var i in Model)
{
<tr style="border:1px solid black">
<td>#Html.TextBoxFor(a => a[j].firstName)</td>
<td>#Html.TextBoxFor(a => a[j].lastName)</td>
<td>#Html.TextBoxFor(a => a[j].case_id)</td>
<td>
#if (j > 0)
{
Remove
}
</td>
</tr>
j++;
}
}
</table>
<input type="submit" value="Save" />
}
</div>
and my controller looks like :
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
namespace TestMVC.Controllers
{
public class SaveController : Controller
{
//
// GET: /Save/
public ActionResult BulkData()
{
Case bc = new Case {case_id=0,case_no=""};
// This is only for show by default one row for insert data to the database
List<Family> ci = new List<Family> { new Family { family_id = 0, firstName = "", lastName = "", case_id= 0 } };
return View(ci);
}
[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult BulkData(List<Family> ci)
{
if (ModelState.IsValid)
{
using (FamilyContext dc = new FamilyContext())
{
var behaveCase = new Case();
behaveCase.case_no = "1234";
dc.Cases.add(behaveCase);
foreach (var i in ci)
{
i.Case = behaveCase;
dc.Families.Add(i);
}
dc.SaveChanges();
ViewBag.Message = "Data successfully saved!";
ModelState.Clear();
ci = new List<Family> { new Family { family_id = 0, firstName = "", lastName = "", case_id = 0 } };
}
}
return View(ci);
}
}
}
and my model definitions
namespace TestMVC
{
using System;
using System.Collections.Generic;
public partial class Case
{
public Case()
{
this.Families = new HashSet<Family>();
}
public int case_id { get; set; }
public string case_no { get; set; }
public virtual ICollection<Family> Families { get; set; }
}
}
namespace TestMVC
{
using System;
using System.Collections.Generic;
public partial class Family
{
public int family_id { get; set; }
public string firstName { get; set; }
public string lastName { get; set; }
public int case_id { get; set; }
public virtual Case Case { get; set; }
}
}

Answer 1

Model which is added that is 'i' over here : dc.Families.Add(i); when dc.SaveChanges() called it will modify 'i' with its primary key as :
if (ModelState.IsValid)
{
using (FamilyContext dc = new FamilyContext())
{
var behaveCase = new Case();
behaveCase.case_no = "1234";
dc.Cases.add(behaveCase);
dc.SaveChanges(); // Save Changes Occurred. primary key in inserted in behaveCase
int pk = behaveCase.case_id; // You can get primary key of your inserted row
foreach (var i in ci)
{
i.Case = behaveCase;
dc.Families.Add(i);
dc.SaveChanges(); // Save Changes Occured. Primary key of i is inserted
int pkFam = i.family_id; // You can get primary key of your inserted row
}
ViewBag.Message = "Data successfully saved!";
ModelState.Clear();
ci = new List<Family> { new Family { family_id = 0, firstName = "", lastName = "", case_id = 0 } };
}
}