SerializationFormat.Binary is obsolete (#7841)

Author: gewarren

xml/System.Data/SerializationFormat.xml

@@ -38,11 +38,12 @@
     <remarks>
       <format type="text/markdown"><![CDATA[  
   
-## Remarks  
- Microsoft ADO.NET 2.0 introduces the ability to serialize a <xref:System.Data.DataSet> as binary content. Earlier versions of the Microsoft .NET Framework do not support binary serialization.  
-  
- The default format is Xml. This is backward compatible and will work with all versions of the .NET Framework.  
-  
+## Remarks
+
+Microsoft ADO.NET 2.0 introduced the ability to serialize a <xref:System.Data.DataSet> as binary content. Earlier versions of .NET Framework did not support binary serialization. The `Binary` field is obsolete starting in .NET 7, because it relies on <xref:System.Runtime.Serialization.Formatters.Binary.BinaryFormatter>, which is inherently insecure.
+
+The default format is `Xml`. This format is backward compatible and will work with all versions of .NET.
+
  ]]></format>
     </remarks>
   </Docs>
@@ -80,7 +81,7 @@
       </ReturnValue>
       <MemberValue>1</MemberValue>
       <Docs>
-        <summary>Serialize as binary content. Available in ADO.NET 2.0 only.</summary>
+        <summary>Serialize as binary content. Available in ADO.NET 2.0 and later versions only. This field is obsolete starting in .NET 7.</summary>
       </Docs>
     </Member>
     <Member MemberName="Xml">