[ASP.NET Core MVC - Movie Database tutorial] SqlNullValueException: Data is Null' error occurs after adding the [Required] attribute to the 'Rating' field in a Movie class while working on 'Part 9: Adding Validation to an ASP.NET Core MVC App.'

### Is there an existing issue for this?

- [X] I have searched the existing issues

### Describe the bug

**Issue Summary:** I encountered a 'SqlNullValueException: Data is Null' error while working on 'Part 9: Adding Validation to an ASP.NET Core MVC App.' This error occurred when I added the [Required] attribute to the 'Rating' field in my Movie class.

**Description:** Before adding the validation rules [before Part 9], my code worked just fine. However, after implementing the required attributes, the code broke. To diagnose the issue, I began debugging it line-by-line and discovered that the 'SqlNullValueException: Data is Null' error occurred immediately after adding the `[Required]` attribute to the 'Rating' field.

**Solution:** I removed the attribute from my code, and this action resolved the issue. I believe this workaround could be helpful to anyone who encounters a similar problem and finds themselves stuck while moving forward.

### Expected Behavior

_No response_

### Steps To Reproduce

_No response_

### Exceptions (if any)

_No response_

### .NET Version

8.0.101

### Anything else?

Microsoft Visual Studio Community 2022 (64-bit) : Version 17.8.1
Microsoft .NET Version ; 4.8.09032