Handling Multiple Concurrent Database Updates with Entity Framework Core in C#
I'm optimizing some code but I recently switched to I tried several approaches but none seem to work... I'm a bit lost with I'm facing an issue with concurrent updates in my ASP.NET Core application using Entity Framework Core 6.0. I have a scenario where multiple users can update the same record in the database simultaneously. For instance, if User A starts editing a record and User B tries to update the same record before User A saves their changes, I want to ensure that User B's changes do not overwrite User A's changes unexpectedly. I've attempted to use optimistic concurrency control by adding a `RowVersion` property to my entity model, like this: ```csharp public class Product { public int Id { get; set; } public string Name { get; set; } public decimal Price { get; set; } [Timestamp] public byte[] RowVersion { get; set; } } ``` In my `DbContext`, I configure the entity: ```csharp protected override void OnModelCreating(ModelBuilder modelBuilder) { modelBuilder.Entity<Product>() .Property(p => p.RowVersion) .IsRowVersion(); } ``` When updating a record, I retrieve it first, modify it, and then try to save it: ```csharp var product = await _context.Products.FindAsync(productId); product.Price = newPrice; await _context.SaveChangesAsync(); ``` However, when User B tries to save their changes, I get the following exception: ``` DbUpdateConcurrencyException: The database operation was expected to affect 1 row(s) but actually affected 0 row(s). ``` I understand that this exception indicates that the record being updated has changed since it was loaded, but I'm unsure how to handle this gracefully. I want to inform the user that their changes could not be saved because the record was modified by someone else. What is the best approach to handle this concurrency issue and provide a user-friendly feedback mechanism? Any insights or examples on how to implement this correctly would be greatly appreciated. I'd really appreciate any guidance on this. I'm using C# latest in this project. I'd really appreciate any guidance on this. The project is a mobile app built with C#. Am I missing something obvious? My development environment is Ubuntu 20.04. Am I approaching this the right way? The project is a application built with C#. How would you solve this?