# System.ComponentModel.Design.Serialization

``` diff
 namespace System.ComponentModel.Design.Serialization {
     public sealed class ExpressionContext {
-        public ExpressionContext(CodeExpression expression, Type expressionType, object owner, object presetValue);
+        public ExpressionContext(CodeExpression expression, Type expressionType, object owner, object? presetValue);
-        public object PresetValue { get; }
+        public object? PresetValue { get; }
     }
     public sealed class ObjectStatementCollection : IEnumerable {
-        public CodeStatementCollection this[object statementOwner] { get; }
+        public CodeStatementCollection? this[object statementOwner] { get; }
     }
 }
```

