From cb2cff4681c00cdbf805d1ad1a99baf1e39a4059 Mon Sep 17 00:00:00 2001
From: Hong Li <hongli@microsoft.com>
Date: Mon, 11 Mar 2019 18:58:38 -0700
Subject: [PATCH] compat doc for bug#563497

---
 ...ionContext.MemberName is null sometimes.md | 34 +++++++++++++++++++
 1 file changed, 34 insertions(+)
 create mode 100644 Documentation/compatibility/aspnet-ASP.NET ValidationContext.MemberName is null sometimes.md

diff --git a/Documentation/compatibility/aspnet-ASP.NET ValidationContext.MemberName is null sometimes.md b/Documentation/compatibility/aspnet-ASP.NET ValidationContext.MemberName is null sometimes.md
new file mode 100644
index 000000000..25a61e962
--- /dev/null
+++ b/Documentation/compatibility/aspnet-ASP.NET ValidationContext.MemberName is null sometimes.md	
@@ -0,0 +1,34 @@
+## 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
+
+-->
+
+