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ASP.NET MVC Model validation not working on one of the controller constructor

I have model validation for user register,login and update. However the model validation only works on login and register. The update function does not respond either
The model
namespace DDemo.Models
{
public class SysUser
{
[Required(ErrorMessage = "Please enter User ID")]
[Remote(action: "VerifyUserID", controller: "Account")]
public string InvestorId { get; set; }
[Required(ErrorMessage = "Please enter Password")]
[StringLength(20, MinimumLength = 5, ErrorMessage = "Password must be 5 characters or more")]
public string InvestorPw { get; set; }
[Compare("InvestorPw", ErrorMessage = "Passwords do not match")]
public string InvestorPw2 { get; set; }
[Required(ErrorMessage = "Please enter Full Name")]
public string FullName { get; set; }
[Required(ErrorMessage = "Please enter Email")]
[EmailAddress(ErrorMessage = "Invalid Email")]
public string Email { get; set; } //# sign
[Required(ErrorMessage = "Please enter Contact Number")]
[RegularExpression(#"\d{8}", ErrorMessage = "Please enter 8 digit number")]
public string Contact { get; set; }
public DateTime LastLogin { get; set; }
}
}
The controller
[Authorize]
[HttpPost]
public IActionResult UserUpdate(SysUser user)
{
if (!ModelState.IsValid)
{
ViewData["Message"] = "Invalid Input";
ViewData["MsgType"] = "warning";
return View("UserUpdate", user);
}
else
{
string update =
#"
UPDATE Investor
SET InvestorPw = ('SHA1', '{1}'), FullName = '(2)', Email = '{3}', Contact = '{4}'
WHERE InvestorId = '{0}'";
int result = DBUtl.ExecSQL(update, user.InvestorId, user.InvestorPw, user.FullName, user.Email, user.Contact);
if (result == 1)
{
TempData["Message"] = "Account Updated";
TempData["MsgType"] = "success";
}
else
{
TempData["Message"] = DBUtl.DB_Message;
TempData["MsgType"] = "danger";
}
return RedirectToAction("Users");
}
}
The view
#model SysUser
<form asp-controller="Account"
asp-action="UserUpdate"
method="post">
<div class="form-group row">
<div class="offset-sm-0 col-sm-4">
<h2>Update Your Account</h2>
</div>
</div>
</form>
<div class="form-group row">
<label class="control-label col-sm-2" asp-for="InvestorId">User ID :</label>
<div class="col-sm-4">
<input type="text" asp-for="InvestorId" readonly="readonly" class="form-control" />
</div>
<div class="col-sm-3">
<span asp-validation-for="InvestorId" class="text-danger"></span>
</div>
</div>
<div class="form-group row">
<label class="control-label col-sm-2" asp-for="FullName">Full Name :</label>
<div class="col-sm-4">
<input type="text" asp-for="FullName" class="form-control" />
</div>
<div class="col-sm-3">
<span asp-validation-for="FullName" class="text-danger"></span>
</div>
</div>
<div class="form-group row">
<label class="control-label col-sm-2" asp-for="Email">Email ID :</label>
<div class="col-sm-4">
<input type="text" asp-for="Email" class="form-control" />
</div>
<div class="col-sm-3">
<span asp-validation-for="Email" class="text-danger"></span>
</div>
</div>
<div class="form-group row">
<label class="control-label col-sm-2" asp-for="InvestorPw">Password :</label>
<div class="col-sm-4">
<input type="password" asp-for="InvestorPw" class="form-control" />
</div>
<div class="col-sm-3">
<span asp-validation-for="InvestorPw" class="text-danger"></span>
</div>
</div>
<div class="form-group row">
<label class="control-label col-sm-2" asp-for="InvestorPw2">Confirm :</label>
<div class="col-sm-4">
<input type="password" asp-for="InvestorPw2" class="form-control" />
</div>
<div class="col-sm-3">
<span asp-validation-for="InvestorPw2" class="text-danger"></span>
</div>
</div>
<div class="form-group row">
<label class="control-label col-sm-2" asp-for="Contact">Contact :</label>
<div class="col-sm-4">
<input type="text" asp-for="Contact" class="form-control" />
</div>
<div class="col-sm-3">
<span asp-validation-for="Contact" class="text-danger"></span>
</div>
</div>
<div class="form-group row">
<div class="offset-sm-2 col-sm-6">
<input type="submit" value="Submit" class="btn btn-primary" />
</div>
</div>
#if (ViewData["Message"] != null)
{
<div class="form-group row">
<div class="alert alert-#ViewData["MsgType"]">
<text>#ViewData["Message"]</text>
</div>
</div>
}
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As in the picture, model validation works with register but not with update

you have to fix a form tag of your view, move the end of form to below of a submit button and add #Html.ValidationSummary()
<form asp-controller="Account"
asp-action="UserUpdate"
method="post">
#Html.ValidationSummary(true)
<div class="form-group row">
<div class="offset-sm-0 col-sm-4">
<h2>Update Your Account</h2>
</div>
</div>
........
<div class="form-group row">
<div class="offset-sm-2 col-sm-6">
<input type="submit" value="Submit" class="btn btn-primary" />
</div>
</div>
</form>

My viewmodel doesn't populate the view inside Admin Area

I have a view inside Admin area and I want to populate it with the following codes but
when I run the program my view shows nothing except empty controls. It returns string without any problems but have trouble with viewmodels
My viewmodel is as follow:
public class AddQuestionsViewModel
{
[Required]
[MinLength(20)]
public string Question { get; set; }
[Required]
[MinLength(50)]
public string Answer { get; set; }
public string Category { get; set; }
public int CategoryId { get; set; }
public SelectList Categories { get; set; }
public DateTime DateTime { get; set; }
public bool IsDisplayed { get; set; }
public int UserId { get; set; }
}
My view:
#model MosahebeClient.Areas.Admin.Models.AddQuestionsViewModel
#{
ViewData["Title"] = "Create";
Layout = "~/Areas/Admin/Views/Shared/_AdminLayout.cshtml";
}
<div class="row">
<div class="col-md-4">
<form asp-action="Create">
<div asp-validation-summary="ModelOnly" class="text-danger"></div>
<div class="form-group">
<label asp-for="Question" class="control-label"></label>
<input asp-for="Question" class="form-control" />
<span asp-validation-for="Question" class="text-danger"></span>
</div>
<div class="form-group">
<label asp-for="Answer" class="control-label"></label>
<input asp-for="Answer" class="form-control" />
<span asp-validation-for="Answer" class="text-danger"></span>
</div>
<div class="form-group">
<label asp-for="Category" class="control-label"></label>
<input asp-for="Category" class="form-control" />
<span asp-validation-for="Category" class="text-danger"></span>
</div>
<div class="form-group">
<label asp-for="CategoryId" class="control-label"></label>
<input asp-for="CategoryId" class="form-control" />
<span asp-validation-for="CategoryId" class="text-danger"></span>
</div>
<div class="form-group">
<label asp-for="DateTime" class="control-label"></label>
<input asp-for="DateTime" class="form-control" />
<span asp-validation-for="DateTime" class="text-danger"></span>
</div>
<div class="form-group form-check">
<label class="form-check-label">
<input class="form-check-input" asp-for="IsDisplayed" /> #Html.DisplayNameFor(model => model.IsDisplayed)
</label>
</div>
<div class="form-group">
<label asp-for="UserId" class="control-label"></label>
<input asp-for="UserId" class="form-control" />
<span asp-validation-for="UserId" class="text-danger"></span>
</div>
<div class="form-group">
<input type="submit" value="Create" class="btn btn-primary" />
</div>
</form>
</div>
</div>
<div>
My Controller:
[Area("Admin")]
public ActionResult Create()
{
AddQuestionsViewModel model = new AddQuestionsViewModel();
model.Categories = new SelectList(_categoryRepository.GetAll(), "Id", "Name");
return View(model);
}

Do you want to add a drop-down list to your view? If so, you can add the following code in your view.
//...
<select asp-items="#Model.Categories">
<option>Please select a option</option>
</select>
//...

Passing a String value through asp-for="..." into a Model in ASP.Net core isn't working the way it should

So i try to pass a password type of String by sending the Form, all the other data is working the way it should but when i try the same thing with the 2 passwords there just happens nothing.
<hr />
<div class="row">
<div class="col-md-4">
<form method="post">
<div asp-validation-summary="ModelOnly" class="text-danger"></div>
<div class="form-group">
<label asp-for="Userdata.Username" class="control-label"></label>
<input asp-for="Userdata.Username" class="form-control" required />
<span asp-validation-for="Userdata.Username" class="text-danger"></span>
</div>
<div class="form-group">
<label asp-for="Password1" class="control-label">Password</label>
<input asp-for="Password1" class="form-control" type="password" required />
<span asp-validation-for="Password1" class="text-danger"></span>
</div>
<div class="form-group">
<label asp-for="Password2" class="control-label">Password</label>
<input asp-for="Password2" class="form-control" type="password" required />
<span asp-validation-for="Password2" class="text-danger"></span>
</div>
<div class="form-group">
<label asp-for="Userdata.Role" class="control-label"></label>
<input asp-for="Userdata.Role" class="form-control" required />
<span asp-validation-for="Userdata.Role" class="text-danger"></span>
</div>`
<div class="form-group">
<input type="submit" value="Create" class="btn btn-primary" />
</div>
</form>
</div>
</div>
The upper Code is from the csHTML
[BindProperty]
public Userdata Userdata { get; set; }
public String Password1 { get; set; }
public String Password2 { get; set; }
// To protect from overposting attacks, enable the specific properties you want to bind to, for
// more details, see https://aka.ms/RazorPagesCRUD.
public async Task<IActionResult> OnPostAsync()
{
if (!ModelState.IsValid)
{
return Page();
}
if (Password1 != Password2)
{
errormessage = "Passwords don't Match";
return null;
}
The upper code is from the Model class where i try to check if the Passwords match but they keep beeing Null

If the two passwords are in your Userdata model,you need use Userdata.Password1 and Userdata.Password2 in frontend:
<div class="form-group">
<label asp-for="Userdata.Password1" class="control-label">Password</label>
<input asp-for="Userdata.Password1" class="form-control" type="password" required />
<span asp-validation-for="Userdata.Password1" class="text-danger"></span>
</div>
<div class="form-group">
<label asp-for="Userdata.Password2" class="control-label">Password</label>
<input asp-for="Userdata.Password2" class="form-control" type="password" required />
<span asp-validation-for="Userdata.Password2" class="text-danger"></span>
</div>
If you just want receive data for the following property:
public String Password1 { get; set; }
public String Password2 { get; set; }
You need add [BindProperty] attribute on them:
[BindProperty]
public String Password1 { get; set; }
[BindProperty]
public String Password2 { get; set; }
Result:

Passing double value for coordinates in .NET Core MVC 3.1

I struggle with issue to pass value for double property. As property regards coordinates (Latitude, Longitude) their format will be ###.######. On my PC default numeric format is ### ###,##
My input field pass only values ###,###. If put something different like:
1234,444 then I receive message "The field Latitude must be a number." and in code property got value 0
130.653221 =>the same, property receive 0 and I got message "The value '130.653221' is not valid for Latitude."
12,1234 then client validator won't pass me because "The field Latitude must be a number."
I tried to put regular expression in ViewModel e.g. [RegularExpression(#"^\d+.\d{0,6}$")] but unsuccessful.
Is there any way to change format of value to ###.######?
Below you can find my code:
ViewModel
public class ShopLocationViewModel
{
public int Id { get; set; }
public string Header { get; set; }
public string FirstText { get; set; }
public string SecondText { get; set; }
public string ThirdText { get; set; }
public string LinkText { get; set; }
public string Link { get; set; }
public double Latitude { get; set; }
public double Longitude { get; set; }
public int Priority { get; set; }
}
Controller:
[HttpPost]
[ValidateAntiForgeryToken]
public ActionResult Create([Bind("Header,FirstText,SecondText,ThirdText,LinkText,Link,Latitude,Longitude,Priority,Id")] ShopLocationViewModel shopLocation)
{
if (ModelState.IsValid)
{
var shopLocationDto = _viewModelMapper.Map(shopLocation);
_dataManger.AddNewShopLocation(shopLocationDto);
return RedirectToAction(nameof(Index));
}
return View(shopLocation);
}
View:
#model ShopLocationViewModel
<div class="row">
<div class="col-md-4">
<form asp-action="Create">
<div asp-validation-summary="ModelOnly" class="text-danger"></div>
<div class="form-group">
<label asp-for="Header" class="control-label"></label>
<input asp-for="Header" class="form-control" />
<span asp-validation-for="Header" class="text-danger"></span>
</div>
<div class="form-group">
<label asp-for="FirstText" class="control-label"></label>
<input asp-for="FirstText" class="form-control" />
<span asp-validation-for="FirstText" class="text-danger"></span>
</div>
<div class="form-group">
<label asp-for="SecondText" class="control-label"></label>
<input asp-for="SecondText" class="form-control" />
<span asp-validation-for="SecondText" class="text-danger"></span>
</div>
<div class="form-group">
<label asp-for="ThirdText" class="control-label"></label>
<input asp-for="ThirdText" class="form-control" />
<span asp-validation-for="ThirdText" class="text-danger"></span>
</div>
<div class="form-group">
<label asp-for="LinkText" class="control-label"></label>
<input asp-for="LinkText" class="form-control" />
<span asp-validation-for="LinkText" class="text-danger"></span>
</div>
<div class="form-group">
<label asp-for="Link" class="control-label"></label>
<input asp-for="Link" class="form-control" />
<span asp-validation-for="Link" class="text-danger"></span>
</div>
<div class="form-group">
<label asp-for="Latitude" class="control-label"></label>
<input asp-for="Latitude" class="form-control" />
<span asp-validation-for="Latitude" class="text-danger"></span>
</div>
<div class="form-group">
<label asp-for="Longitude" class="control-label"></label>
<input asp-for="Longitude" class="form-control" />
<span asp-validation-for="Longitude" class="text-danger"></span>
</div>
<div class="form-group">
<label asp-for="Priority" class="control-label"></label>
<input asp-for="Priority" class="form-control" />
<span asp-validation-for="Priority" class="text-danger"></span>
</div>
<div class="form-group">
<input type="submit" value="Create" class="btn btn-primary" />
</div>
</form>
</div>
#section Scripts {
#{await Html.RenderPartialAsync("_ValidationScriptsPartial");}}

I can't update/edit One to one relationship with Entity Framework Core

All CRUD operations are working except updating/editing. I am using Pomelo since I am using Mysql. For the issue am facing, am using the same create form to edit the data but it throws an exception when I try editing.
This is the exception:
fail: Microsoft.EntityFrameworkCore.Update[10000]
An exception occurred in the database while saving changes for context type 'ICFERApp.Data.ApplicationDbContext'.
Microsoft.EntityFrameworkCore.DbUpdateException: An error occurred while updating the entries. See the inner exception for details.
MySql.Data.MySqlClient.MySqlException: Duplicate entry '3' for key 'IX_Education_StudentId'
MySql.Data.MySqlClient.MySqlException: Duplicate entry '3' for key 'IX_Education_StudentId'
at MySqlConnector.Core.ResultSet.ReadResultSetHeaderAsync(IOBehavior
ioBehavior) in C:\projects\mysqlconnector\src\MySqlConnector\Core\ResultSet.cs:line 43
--- End of inner exception stack trace ---
at MySql.Data.MySqlClient.MySqlDataReader.ActivateResultSet(ResultSet
resultSet) in C:\projects\mysqlconnector\src\MySqlConnector\MySql.Data.MySqlClient\MySqlDataReader.cs:line 81
at MySql.Data.MySqlClient.MySqlDataReader.ReadFirstResultSetAsync(IOBehavior
ioBehavior) in C:\projects\mysqlconnector\src\MySqlConnector\MySql.Data.MySqlClient\MySqlDataReader.cs:line 307
These are my model classes:
public class Student
{
[Key]
public long Id { get; set; }
[Display(Name="First Name")]
public string FirstName { get; set; }
[Display(Name="Middle Name")]
public string MiddleName { get; set; }
[Display(Name="Last Name")]
public string LastName { get; set; }
[Display(Name="Nationality")]
public string Nationality { get; set; }
[Display(Name="Gender")]
public string Gender { get; set; }
[Display(Name="Religion")]
public string Religion { get; set; }
[Display(Name="Medical Condition")]
public string MedicalCondition { get; set; }
[Display(Name="Deceased")]
public string Deceased { get; set; }
[Display(Name="Home Address")]
public string HomeAddress { get; set; }
[Display(Name="Country Of Residence")]
public string CountryOfResidence { get; set; }
[Display(Name="City")]
public string City { get; set; }
[Display(Name="Date Of Birth")]
public DateTime DateOfBirth { get; set; }
public int Age { get; set; }
public virtual Parents Parents { get; set; }
public virtual Education Education { get; set; }
}
public class Parents
{
public long Id { get; set; }
[Display(Name="Religion Of Deceased Father")]
public string ReligionOfDeceasedFather { get; set; }
[Display(Name="Religion Of Deceased Mother")]
public string ReligionOfDeceasedMother { get; set; }
[Display(Name="Date Of Demise Father")]
[DisplayFormat(DataFormatString = "{0:dd.MM.yyyy}")]
public DateTime DateOfDemiseOfFather { get; set; }
[Display(Name="Date Of Demise Mother")]
[DisplayFormat(DataFormatString = "{0:dd.MM.yyyy}")]
public DateTime DateOfDemiseOfMother { get; set; }
[Display(Name="Names of Mother")]
public string NamesOfMother { get; set; }
[Display(Name="Names of Father")]
public string NamesOfFather { get; set; }
[Display(Name="Religion of Mother")]
public string ReligionOfMother { get; set; }
[Display(Name="Marital Status of Mother")]
public string MaritalStatusOfMother { get; set; }
[Display(Name="Occupation of Mother")]
public string OccupationOfMother { get; set; }
[Display(Name="Monthly Income")]
public double MonthlyIncome { get; set; }
public virtual Student Student { get; set; }
public long? StudentId { get; set; }
}
public class Education
{
public long Id { get; set; }
[Display(Name="Education Level")]
public string EducationLevel { get; set; }
[Display(Name="School")]
public string School { get; set; }
[Display(Name="Address of School")]
public string AddressOfSchool { get; set; }
[Display(Name="Head Teacher")]
public string HeadTeacher { get; set; }
[Display(Name="Telephone")]
public string Telephone { get; set; }
public virtual Student Student { get; set; }
public long? StudentId { get; set; }
}
My question would be why can't I be able to update automatically with the Entity Framework Core?
These are the methods responsible for editing in my Controller class :
[HttpPost]
public IActionResult New(Student student, string IsEditMode)
{
if (!ModelState.IsValid)
{
ViewBag.IsEditMode = IsEditMode;
return View(student);
}
try
{
if (IsEditMode.Equals("false"))
{
_studentRepository.Create(student);
}
else
{
_studentRepository.Edit(student);
}
return RedirectToAction(nameof(Index));
}
catch (Exception e)
{
return RedirectToAction(nameof(Index));
}
}
public IActionResult Edit(int id)
{
try
{
ViewBag.IsEditMode = "true";
var student = _studentRepository.GetSingleStudent(id);
return View("New", student);
}
catch (Exception ex)
{
return Content("Could not find Pet");
}
}
Then, in my Repository class, this is the Edit method:
public void Edit(Student student)
{
_context.Students.Update(student);
_context.SaveChanges();
}
I will be very grateful with help regarding this blocker. Thanks.
EDIT
This is my form which handles both Creating and Editing.
#model Student
<form asp-action="New" method="Post" asp-controller="Student">
<div asp-validation-summary="All"></div>
<input asp-for="Id" type="hidden"/>
<input name="IsEditMode" id="IsEditMode" value="#ViewBag.IsEditMode" type="hidden"/>
<div class="form-row">
<div class="col">
<label asp-for="FirstName"></label>
<input asp-for="FirstName" class="form-control"/>
<span asp-validation-for="FirstName" class="text-danger"></span>
</div>
<div class="col">
<label asp-for="MiddleName"></label>
<input asp-for="MiddleName" class="form-control"/>
<span asp-validation-for="MiddleName" class="text-danger"></span>
</div>
</div>
<div class="form-row">
<div class="col">
<label asp-for="LastName"></label>
<input asp-for="LastName" class="form-control"/>
<span asp-validation-for="LastName" class="text-danger"></span>
</div>
<div class="col">
<label asp-for="Nationality"></label>
<input asp-for="Nationality" class="form-control"/>
<span asp-validation-for="Nationality" class="text-danger"></span>
</div>
</div>
<div class="form-row">
<div class="col">
<label asp-for="Gender"></label>
<input asp-for="Gender" class="form-control"/>
<span asp-validation-for="Gender" class="text-danger"></span>
</div>
<div class="col">
<label asp-for="Religion"></label>
<input asp-for="Religion" class="form-control"/>
<span asp-validation-for="Religion" class="text-danger"></span>
</div>
</div>
<div class="form-row">
<div class="col">
<label asp-for="MedicalCondition"></label>
<input asp-for="MedicalCondition" class="form-control"/>
<span asp-validation-for="MedicalCondition" class="text-danger"></span>
</div>
<div class="col">
<label asp-for="Deceased"></label>
<input asp-for="Deceased" class="form-control"/>
<span asp-validation-for="Deceased" class="text-danger"></span>
</div>
</div>
<div class="form-row">
<div class="col">
<label asp-for="HomeAddress"></label>
<input asp-for="HomeAddress" class="form-control"/>
<span asp-validation-for="HomeAddress" class="text-danger"></span>
</div>
<div class="col">
<label asp-for="CountryOfResidence"></label>
<input asp-for="CountryOfResidence" class="form-control"/>
<span asp-validation-for="CountryOfResidence" class="text-danger"></span>
</div>
</div>
<div class="form-row">
<div class="col">
<label asp-for="City"></label>
<input asp-for="City" class="form-control"/>
<span asp-validation-for="City" class="text-danger"></span>
</div>
<div class="col">
<label asp-for="DateOfBirth"></label>
<input asp-for="DateOfBirth" class="form-control"/>
<span asp-validation-for="DateOfBirth" class="text-danger"></span>
</div>
</div>
<div class="form-row">
<div class="col">
<label asp-for="Parents.ReligionOfDeceasedFather"></label>
<input asp-for="Parents.ReligionOfDeceasedFather" class="form-control"/>
<span asp-validation-for="Parents.ReligionOfDeceasedFather" class="text-danger"></span>
</div>
<div class="col">
<label asp-for="Parents.ReligionOfDeceasedMother"></label>
<input asp-for="Parents.ReligionOfDeceasedMother" class="form-control"/>
<span asp-validation-for="Parents.ReligionOfDeceasedMother" class="text-danger"></span>
</div>
</div>
<div class="form-row">
<div class="col">
<label asp-for="Parents.DateOfDemiseOfFather"></label>
<input asp-for="Parents.DateOfDemiseOfFather" class="form-control"/>
<span asp-validation-for="Parents.DateOfDemiseOfFather" class="text-danger"></span>
</div>
<div class="col">
<label asp-for="Parents.DateOfDemiseOfMother"></label>
<input asp-for="Parents.DateOfDemiseOfMother" class="form-control"/>
<span asp-validation-for="Parents.DateOfDemiseOfMother" class="text-danger"></span>
</div>
</div>
<div class="form-row">
<div class="col">
<label asp-for="Parents.NamesOfMother"></label>
<input asp-for="Parents.NamesOfMother" class="form-control"/>
<span asp-validation-for="Parents.NamesOfMother" class="text-danger"></span>
</div>
<div class="col">
<label asp-for="Parents.NamesOfFather"></label>
<input asp-for="Parents.NamesOfFather" class="form-control"/>
<span asp-validation-for="Parents.NamesOfFather" class="text-danger"></span>
</div>
</div>
<div class="form-row">
<div class="col">
<label asp-for="Parents.ReligionOfMother"></label>
<input asp-for="Parents.ReligionOfMother" class="form-control"/>
<span asp-validation-for="Parents.ReligionOfMother" class="text-danger"></span>
</div>
<div class="col">
<label asp-for="Parents.MaritalStatusOfMother"></label>
<input asp-for="Parents.MaritalStatusOfMother" class="form-control"/>
<span asp-validation-for="Parents.MaritalStatusOfMother" class="text-danger"></span>
</div>
</div>
<div class="form-row">
<div class="col">
<label asp-for="Parents.OccupationOfMother"></label>
<input asp-for="Parents.OccupationOfMother" class="form-control"/>
<span asp-validation-for="Parents.OccupationOfMother" class="text-danger"></span>
</div>
<div class="col">
<label asp-for="Parents.MonthlyIncome"></label>
<input asp-for="Parents.MonthlyIncome" class="form-control"/>
<span asp-validation-for="Parents.MonthlyIncome" class="text-danger"></span>
</div>
</div>
<div class="form-row">
<div class="col">
<label asp-for="Guardian.FirstName"></label>
<input asp-for="Guardian.FirstName" class="form-control"/>
<span asp-validation-for="Guardian.FirstName" class="text-danger"></span>
</div>
<div class="col">
<label asp-for="Guardian.MiddleName"></label>
<input asp-for="Guardian.MiddleName" class="form-control"/>
<span asp-validation-for="Guardian.MiddleName" class="text-danger"></span>
</div>
</div>
<div class="form-row">
<div class="col">
<label asp-for="Guardian.LastName"></label>
<input asp-for="Guardian.LastName" class="form-control"/>
<span asp-validation-for="LastName" class="text-danger"></span>
</div>
<div class="col">
<label asp-for="Guardian.RelationshipToOrphan"></label>
<input asp-for="Guardian.RelationshipToOrphan" class="form-control"/>
<span asp-validation-for="Guardian.RelationshipToOrphan" class="text-danger"></span>
</div>
</div>
<div class="form-row">
<div class="col">
<label asp-for="Guardian.Occupation"></label>
<input asp-for="Guardian.Occupation" class="form-control"/>
<span asp-validation-for="Guardian.Occupation" class="text-danger"></span>
</div>
<div class="col">
<label asp-for="Guardian.MonthlyIncome"></label>
<input asp-for="Guardian.MonthlyIncome" class="form-control"/>
<span asp-validation-for="Guardian.MonthlyIncome" class="text-danger"></span>
</div>
</div>
<div class="form-row">
<div class="col">
<label asp-for="Guardian.EmployersName"></label>
<input asp-for="Guardian.EmployersName" class="form-control"/>
<span asp-validation-for="Guardian.EmployersName" class="text-danger"></span>
</div>
<div class="col">
<label asp-for="Guardian.WorkAddress"></label>
<input asp-for="Guardian.WorkAddress" class="form-control"/>
<span asp-validation-for="Guardian.WorkAddress" class="text-danger"></span>
</div>
</div>
<div class="form-row">
<div class="col">
<label asp-for="Guardian.MobileNo"></label>
<input asp-for="Guardian.MobileNo" class="form-control"/>
<span asp-validation-for="Guardian.MobileNo" class="text-danger"></span>
</div>
<div class="col">
<label asp-for="Guardian.PhysicalLocation"></label>
<input asp-for="Guardian.PhysicalLocation" class="form-control"/>
<span asp-validation-for="Guardian.PhysicalLocation" class="text-danger"></span>
</div>
</div>
<div class="form-row">
<div class="col">
<label asp-for="Guardian.Comments"></label>
<input asp-for="Guardian.Comments" class="form-control"/>
<span asp-validation-for="Guardian.Comments" class="text-danger"></span>
</div>
<div class="col">
<label asp-for="Education.EducationLevel"></label>
<input asp-for="Education.EducationLevel" class="form-control"/>
<span asp-validation-for="Education.EducationLevel" class="text-danger"></span>
</div>
</div>
<div class="form-row">
<div class="col">
<label asp-for="Education.School"></label>
<input asp-for="Education.School" class="form-control"/>
<span asp-validation-for="Education.School" class="text-danger"></span>
</div>
<div class="col">
<label asp-for="Education.AddressOfSchool"></label>
<input asp-for="Education.AddressOfSchool" class="form-control"/>
<span asp-validation-for="Education.AddressOfSchool" class="text-danger"></span>
</div>
</div>
<div class="form-row">
<div class="col">
<label asp-for="Education.HeadTeacher"></label>
<input asp-for="Education.HeadTeacher" class="form-control"/>
<span asp-validation-for="Education.HeadTeacher" class="text-danger"></span>
</div>
<div class="col">
<label asp-for="Education.Telephone"></label>
<input asp-for="Education.Telephone" class="form-control"/>
<span asp-validation-for="Education.Telephone" class="text-danger"></span>
</div>
</div>
<div class="form-row">
<div class="col">
<label asp-for="Siblings.NumberOfBrothers"></label>
<input asp-for="Siblings.NumberOfBrothers" class="form-control"/>
<span asp-validation-for="Siblings.NumberOfBrothers" class="text-danger"></span>
</div>
<div class="col">
<label asp-for="Siblings.NumberOfSisters"></label>
<input asp-for="Siblings.NumberOfSisters" class="form-control"/>
<span asp-validation-for="Siblings.NumberOfSisters" class="text-danger"></span>
</div>
</div>
<div class="form-group">
<input asp-for="FirstName" type="submit" value="Save Student" class="btn btn-primary"/>
</div>
</form>

This is how you can update all the tables
public void Edit(Student student)
{
var existingStudent = _context.Students.FirstOrDefault(s => s.Id == student.Id);
if (existingStudent != null)
{
//do the update to the database
_context.Entry(existingStudent).CurrentValues.SetValues(student);
_context.Entry(existingStudent).State = System.Data.Entity.EntityState.Modified;
//then update the parent this way
//first get the particular parent for this student
var parent = _context.Parents.FirstOrDefault(m => m.StudentId == existingStudent.Id);
_context.Entry(parent).CurrentValues.SetValues(student.Parents);
_context.Entry(parent).State = System.Data.Entity.EntityState.Modified;
//do the same for Educations
}
_context.SaveChanges();
}