Cleanup

UserService/Pages/SecurityGroups.razor.cs

@@ -96,13 +96,17 @@ namespace UserService.Pages
         {
             if (SelectedMember is null) return;
             if (SelectedSecurityGroup is null) return;
-            SelectedSecurityGroup.Members.Add(new MembersMember
+            if (!SelectedSecurityGroup.Members.Add(new MembersMember
             {
                 MemberId = SelectedSecurityGroup.Id,
                 Member = SelectedSecurityGroup,
                 AttachedMemberId = SelectedMember.Id,
                 AttachedMember = SelectedMember
-            });
+            }))
+            {
+                await JsRuntime.AlertAsync("User already part of the list.").ConfigureAwait(false);
+            }
+
             SelectedMember = default;
         }