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Dec 19, 2024
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compat doc for bug#563497 #13

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34 changes: 34 additions & 0 deletions .../compatibility/aspnet-ASP.NET ValidationContext.MemberName is null sometimes.md
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## ASP.NET ValidationContext.MemberName is not NULL when using custom DataAnnotations.ValidationAttribute

### Version Introduced
4.8

### Change Description
When using custom `DataAnnotations.ValidationAttribute`, `System.ComponentModel.DataAnnotations.ValidationContext.MemberName` returns null. This issue is fixed in .NET 4.8.


### Recommended Action
Starting from .NET 4.8, the default behavior stays the same. Please use the following appsettings to retrieve valud of `ValidationContext.MemberName` property:

```xml
<configuration>
<appSettings>
...
<add key="aspnet:GetValidationMemberName" value="true"/>
...
</appSettings>
</configuration>
```

### Affected APIs
`System.ComponentModel.DataAnnotations.ValidationContext.MemberName`

### Category
ASP.NET

<!--
### 563497 <ASP.NET WebForms> ValidationContext.MemberName is NULL with custom DataAnnotations.ValidationAttribute

-->


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