Save changes in database controller class asp.net mvc5 identity - asp.net-mvc-5

Question

Visual Studio 2013, ASP.NEt MVC 5 Identity
Please someone help me in how to save the information in the database through controller. Let me explain...I want the following to happen:
The user when logged is able update his Education information. After making changes in the fields, he will press the save button and the information is saved in the database. This works fine when i am doing so with the default aspnet users class, i take the usermanager. update method and the info is saved, but i am unable to do so with for any other table. I would be really thankful if someone helps me.
Here's the controller class edit method
public async Task<ActionResult> Edit(string id, Education education)
{
if (!User.Identity.IsAuthenticated)
{
Response.Redirect("~/Account/Login");
}
var db = new ApplicationDbContext();
var educationdb = db.Edu.First(u => u.EducationID == education.EducationID);
educationdb.Qualification = education.Qualification;
educationdb.School = education.School;
educationdb.SchFrom = education.SchFrom;
educationdb.SchTo = education.SchTo;
educationdb.College = education.College;
educationdb.ClgFrom = education.ClgFrom;
educationdb.ClgTo = education.ClgTo;
educationdb.University = education.University;
educationdb.UniFrom = education.UniTo;
educationdb.Description = education.Description;
db.Entry(educationdb).State = System.Data.Entity.EntityState.Modified;
await db.SaveChangesAsync();
//return RedirectToAction("Index");
return View();
}
this is the model class:
namespace theme1.Models
{
public class Education
{
public string EducationID { get; set; }
public string UserID { get; set; }
public ApplicationUser User { get; set; }
public string Qualification { get; set; }
public string School { get; set; }
[DataType(DataType.Date)]
public DateTime SchFrom { get; set; }
[DataType(DataType.Date)]
public DateTime SchTo { get; set; }
public string College { get; set; }
[DataType(DataType.Date)]
public DateTime ClgFrom { get; set; }
[DataType(DataType.Date)]
public DateTime ClgTo { get; set; }
public string University { get; set; }
[DataType(DataType.Date)]
public DateTime UniFrom { get; set; }
[DataType(DataType.Date)]
public DateTime UniTo { get; set; }
public string Description { get; set; }
}
}
var educationdb = db.Edu.First(u => u.EducationID == education.EducationID); this line gives me an error Exception Details: System.InvalidOperationException: Sequence contains no elements
Source Error:
Line 109: var educationdb = db.Edu.First(u => u.EducationID == education.EducationID);

Answer 1

Instead of :
var educationdb = db.Edu.First(u => u.EducationID == education.EducationID);
Try this :
var educationdb = db.Edu.Where(u => u.EducationID == education.EducationID).FirstOrDefault();
OR
Instead of :
var educationdb = db.Edu.First(u => u.EducationID == education.EducationID);
Try this :
var educationdb = db.Edu.FirstOrDefault(u => u.EducationID == education.EducationID);

Answer 2

I suspect that your missing the DBSet for Education model in ApplicationContext.
If this doesn't fix it, could you please provide the code for your ApplicationContext class?

Answer 3

I cant comment on your discussion with Kartikeya since I am new to stackoverflow and lack reputation.
But after you changed your lambda:
var educationdb = db.Edu.Where(u => u.EducationID ==
education.EducationID).FirstOrDefault();
From your discussion with Kartikeya It sounds like you are thinking of Creating rather than editing. You cant edit something that doesn´t exist.
// GET: Model
public ActionResult Create()
{
return View();
}
in MVC 5 it is very easy to scaffold the view by right clicking inside that Action and chosing "add view" and insert the information you need, and when you have created the view, create your post method for Create:
[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult Create([Bind(Include ="EducationID, UserId....")] Education education)
{
if (ModelState.IsValid)
{
//any extra logic you might want
db.Edu.Add(education);
db.SaveChanges();
return RedirectToAction("Index");
}
return View(education);
}