# System.Drawing

``` diff
 namespace System.Drawing {
     [NullableAttribute((byte)0)]
     [NullableContextAttribute((byte)1)]
     public sealed class Graphics : MarshalByRefObject, IDeviceContext, IDisposable {
-        [NullableContextAttribute((byte)0)]
-        public delegate bool EnumerateMetafileProc(EmfPlusRecordType recordType, int flags, int dataSize, IntPtr data, PlayRecordCallback callbackData);
+        [NullableContextAttribute((byte)0)]
+        public delegate bool EnumerateMetafileProc(EmfPlusRecordType recordType, int flags, int dataSize, IntPtr data, PlayRecordCallback? callbackData);
     }
 }
```

