diff --git a/src/EventHub.Domain/Data/EventHubDbMigrationService.cs b/src/EventHub.Domain/Data/EventHubDbMigrationService.cs
index b29a92c..fc46d7b 100644
--- a/src/EventHub.Domain/Data/EventHubDbMigrationService.cs
+++ b/src/EventHub.Domain/Data/EventHubDbMigrationService.cs
@@ -33,9 +33,9 @@ namespace EventHub.Data
         {
             try
             {
-                if (!await MigrationsFolderExists())
+                if (!MigrationsFolderExists())
                 {
-                    await AddInitialMigration();
+                    AddInitialMigration();
                     return;
                 }
             }
@@ -70,14 +70,14 @@ namespace EventHub.Data
             await _dataSeeder.SeedAsync();
         }
 
-        private async Task<bool> MigrationsFolderExists()
+        private bool MigrationsFolderExists()
         {
             var dbMigrationsProjectFolder = GetDbMigrationsProjectFolderPath();
 
             return Directory.Exists(Path.Combine(dbMigrationsProjectFolder, "migrations"));
         }
 
-        private async Task AddInitialMigration()
+        private void AddInitialMigration()
         {
             Logger.LogInformation("Creating initial migration...");
 
diff --git a/src/EventHub.Web/Helpers/AllowedExtensionsAttribute.cs b/src/EventHub.Web/Helpers/AllowedExtensionsAttribute.cs
index df4f997..75467cd 100644
--- a/src/EventHub.Web/Helpers/AllowedExtensionsAttribute.cs
+++ b/src/EventHub.Web/Helpers/AllowedExtensionsAttribute.cs
@@ -1,3 +1,4 @@
+#nullable enable
 using System.ComponentModel.DataAnnotations;
 using System.IO;
 using System.Linq;
@@ -16,16 +17,12 @@ namespace EventHub.Web.Helpers
 
         protected override ValidationResult? IsValid(object? value, ValidationContext validationContext)
         {
-            if (value == null)
-            {
-                return ValidationResult.Success;
-            }
-            
             var file = value as IFormFile;
-            var extension = Path.GetExtension(file.FileName);
             
-            if (file.Length > 0 && file != null)
+            if (file is { Length: > 0 })
             {
+                var extension = Path.GetExtension(file.FileName);
+
                 if (!_allowedExtensions.Contains(extension.ToLower()))
                 {
                     return new ValidationResult("This file extension is not allowed. Allowed extensions: " + string.Join(",", _allowedExtensions));
diff --git a/src/EventHub.Web/Pages/Events/Detail.cshtml.cs b/src/EventHub.Web/Pages/Events/Detail.cshtml.cs
index 807babb..f235227 100644
--- a/src/EventHub.Web/Pages/Events/Detail.cshtml.cs
+++ b/src/EventHub.Web/Pages/Events/Detail.cshtml.cs
@@ -8,7 +8,7 @@ namespace EventHub.Web.Pages.Events
     public class DetailPageModel : EventHubPageModel
     {
         [BindProperty(SupportsGet = true)]
-        public string Url { get; set; }
+        public new string Url { get; set; }
 
         public bool IsEventOwner { get; set; }
 
@@ -40,7 +40,7 @@ namespace EventHub.Web.Pages.Events
                         {
                             url = Event.Url
                         }
-                    )
+                    )!
                 );
             }
 
diff --git a/src/EventHub.Web/Pages/Events/Edit.cshtml.cs b/src/EventHub.Web/Pages/Events/Edit.cshtml.cs
index 0e7441e..2637acb 100644
--- a/src/EventHub.Web/Pages/Events/Edit.cshtml.cs
+++ b/src/EventHub.Web/Pages/Events/Edit.cshtml.cs
@@ -22,7 +22,7 @@ namespace EventHub.Web.Pages.Events
     public class EditPageModel : EventHubPageModel
     {
         [BindProperty(SupportsGet = true)]
-        public string Url { get; set; }
+        public new string Url { get; set; }
         
         [BindProperty] 
         public EditEventViewModel Event { get; set; }
diff --git a/src/EventHub.Web/Pages/User.cshtml.cs b/src/EventHub.Web/Pages/User.cshtml.cs
index d91b492..cc03cc2 100644
--- a/src/EventHub.Web/Pages/User.cshtml.cs
+++ b/src/EventHub.Web/Pages/User.cshtml.cs
@@ -24,7 +24,7 @@ namespace EventHub.Web.Pages
             _organizationAppService = organizationAppService;
         }
 
-        public UserDto User { get; set; }
+        public new UserDto User { get; set; }
 
         public async Task<IActionResult> OnGetAsync(string userName)
         {