Change password page

StudentHouseDashboard/WebApp/Pages/ChangePassword.cshtml.cs

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+using Logic;
+using Microsoft.AspNetCore.Authorization;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.AspNetCore.Mvc.RazorPages;
+using Models;
+using System.ComponentModel.DataAnnotations;
+using System.Security.Claims;
+
+namespace WebApp.Pages
+{
+    [Authorize]
+    public class ChangePasswordModel : PageModel
+    {
+        [BindProperty]
+        [DataType(DataType.Password)]
+        [Required(ErrorMessage = "Current password is required.")]
+        public string Password { get; set; }
+        [BindProperty]
+        [DataType(DataType.Password)]
+        [Required(ErrorMessage = "New password is required.")]
+        public string NewPassword { get; set; }
+        [BindProperty]
+        [DataType(DataType.Password)]
+        [Required(ErrorMessage = "Confirmation Password is required.")]
+        [Compare("NewPassword", ErrorMessage = "Confirmation field not matching. Check your new password for mistakes.")]
+        public string ConfirmPassword { get; set; }
+        public void OnGet()
+        {
+        }
+        public void OnPost()
+        {
+            UserManager userManager = new UserManager();
+            User user = userManager.GetUserById(int.Parse(User.FindFirstValue("id")));
+            if (NewPassword == null)
+            {
+                ViewData["confirm"] = "New password not entered. Password not changed.";
+                return;
+            }
+            if (NewPassword != ConfirmPassword)
+            {
+                ViewData["confirm"] = "Password fields do not match. Password not changed.";
+                return;
+            }
+            if (BCrypt.Net.BCrypt.Verify(Password, user.Password))
+            {
+                NewPassword = BCrypt.Net.BCrypt.HashPassword(NewPassword);
+                userManager.UpdateUser(user.ID, user.Name, NewPassword, user.Role);
+                ViewData["confirm"] = "Password successfully changed.";
+            }
+            else
+            {
+                ViewData["confirm"] = "Current password is not correct. Password not changed.";
+            }
+        }
+    }
+}