public async Task <IActionResult> OnPostAsync(string returnUrl = null)
        {
            returnUrl      = returnUrl ?? Url.Content("~/");
            ExternalLogins = (await _signInManager.GetExternalAuthenticationSchemesAsync()).ToList();
            if (ModelState.IsValid)
            {
                var user = new IdentityUser {
                    UserName = Input.Email, Email = Input.Email
                };
                var result = await _userManager.CreateAsync(user, Input.Password);

                if (result.Succeeded)
                {
                    var stocksBuyer = new StocksBuyer
                    {
                        EmailAddress = user.Email,
                        BuyerName    = Input.Name
                    };

                    dataContext.StocksBuyer.Add(stocksBuyer);

                    dataContext.SaveChanges();
                    var roleExistsResult = await _roleManager.RoleExistsAsync("stocks_buyer");

                    if (!roleExistsResult)
                    {
                        var roleReuslt = await _roleManager.CreateAsync(new IdentityRole("stocks_buyer"));

                        if (roleReuslt.Succeeded)
                        {
                            await _userManager.AddToRoleAsync(user, "stocks_buyer");
                        }
                    }
                    else
                    {
                        await _userManager.AddToRoleAsync(user, "stocks_buyer");
                    }

                    _logger.LogInformation("User created a new account with password.");

                    var code = await _userManager.GenerateEmailConfirmationTokenAsync(user);

                    code = WebEncoders.Base64UrlEncode(Encoding.UTF8.GetBytes(code));
                    var callbackUrl = Url.Page(
                        "/Account/ConfirmEmail",
                        pageHandler: null,
                        values: new { area = "Identity", userId = user.Id, code = code },
                        protocol: Request.Scheme);

                    await _emailSender.SendEmailAsync(Input.Email, "Confirm your email",
                                                      $"Please confirm your account by <a href='{HtmlEncoder.Default.Encode(callbackUrl)}'>clicking here</a>.");

                    if (_userManager.Options.SignIn.RequireConfirmedAccount)
                    {
                        return(RedirectToPage("RegisterConfirmation", new { email = Input.Email }));
                    }
                    else
                    {
                        await _signInManager.SignInAsync(user, isPersistent : false);

                        return(LocalRedirect(returnUrl));
                    }
                }
                foreach (var error in result.Errors)
                {
                    ModelState.AddModelError(string.Empty, error.Description);
                }
            }

            // If we got this far, something failed, redisplay form
            return(Page());
        }