LINQ Query return null value - asp.net-mvc-4

Question

when i use Linq query to fetching or compare data within DB it return me null value in morning it works right but now it not working it through exception.
model
public partial class CandidateRegistration
{
public int CandidateID { get; set; }
public string FirstName { get; set; }
public string LastName { get; set; }
public string Email { get; set; }
public string Password { get; set; }
public bool RegisterAs { get; set; }
public Nullable<bool> ApprovedBit { get; set; }
}
public virtual DbSet<CandidateRegistration> CandidateRegistrations { get; set; }
Controller
public ActionResult Login(string emaillogin, string passwordslogin, bool registerAs, string Rememberme)
{
bool aprovedbitforemployer = false;
if (registerAs == true)
{
var checkApprovedBitForEmployer = DB.EmployerRegistrations.FirstOrDefault(e => e.Email == obj.Email);
aprovedbitforemployer = Convert.ToBoolean((checkApprovedBitForEmployer.ApprovedBit));
if (aprovedbitforemployer != false)
{
if(checkApprovedBitForEmployer.Email == emaillogin && checkApprovedBitForEmployer.Passwords == passwordslogin)
{
Session["Username"] = checkApprovedBitForEmployer.Email.ToString();
Session["Passwords"] = checkApprovedBitForEmployer.Passwords.ToString();
Session["Employee"] = "Employer";
}
}
else
{
TempData["Notpermission"] = "Your account is in activation process please wait...";
}
}
else if (registerAs == false)
{
CandidateRegistration checkApprovedBitForEmplloyee = DB.CandidateRegistrations.FirstOrDefault(c => c.Email == emaillogin);
aprovedbitforemployer = Convert.ToBoolean((checkApprovedBitForEmplloyee.ApprovedBit));
if(aprovedbitforemployer == true)
{
if (checkApprovedBitForEmplloyee.Email == emaillogin && checkApprovedBitForEmplloyee.Password == passwordslogin)
{
Session["Username"] = checkApprovedBitForEmplloyee.Email.ToString();
Session["Passwords"] = checkApprovedBitForEmplloyee.Password.ToString();
Session["Employee"] = "Employee";
}
}
else
{
TempData["Notpermission"] = "Your account is in activation process please wait...";
}
}
else
{
TempData["Emailorpasswordmistakes"] = "Email or password incorrect";
}
return View();
}
"checkApprovedBitForEmployer" return null value it=n this variable.
View
#using (Html.BeginForm("Login", "Home", FormMethod.Post))
{
<div class="col-md-6 account">
<h3>Login</h3>
<span id="Emessage" onshow="show();"> #TempData["Notpermission"] </span>
<label for="">Username or email address *</label>
<div class="form-group">
<input type="email" name="emaillogin" id="emaillogin" class="form-control input-sm " placeholder="Email Address" style="width:70%; height: 35px; text-transform:none;">
</div>
<label for="">Password *</label>
<div class="form-group">
<input type="password" name="passwordslogin" id="passwordslogin" class="form-control input-sm" placeholder="Password" style="width:70%; height: 35px; text-transform:none; ">
<span id="Emessage" onshow="show();" >#TempData["Emailorpasswordmistakes"]</span>
</div>
<div class="form-group">
#Html.DropDownList("RegisterAs", new List<SelectListItem>()
{
new SelectListItem() { Text= "Register As", Selected = true },
new SelectListItem() { Text= "Employer", Value = "true" },
new SelectListItem() { Text= "Employee", Value = "false" }
}, new { htmlAttributes = new { #class = "form-control" } })
</div>
<button>Login</button>
<input type="checkbox" id="rememberme" name="Rememberme" value="forever"><span>Remember me</span>
<br />
Lost your Password
</div>
}
i am using html form and i want to use this but only tell me why it not fetch data from database.

Answer 1

var checkApprovedBitForEmployer = DB.EmployerRegistrations.FirstOrDefault(e => e.Email == obj.Email);
In above line you are checking email address from database with Obj.Email.i guess you need to compare with emaillogin.