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docs/standard/serialization/binaryformatter-migration-guide/migrate-to-datacontractserializer.md

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 # Migrate to DataContractSerializer (XML)
 
-The .NET base class libraries provide two XML serializers: [XmlSerializer](../introducing-xml-serialization.md) and [DataContractSerializer](../../../fundamentals/runtime-libraries/system-runtime-serialization-datacontractserializer.md). There are some subtle differences between these two, but for the purpose of the migration, this section focuses only on `DataContractSerializer`. Why? Because it **fully supports the serialization programming model that was used by `BinaryFormatter`**. All the types that are already marked as `[Serializable]` or implement `ISerializable` can be serialized with `DataContractSerializer`. Where is the catch? Known types must be specified up front (that's why it's secure). You need to know them and be able to get the `Type`, **even for private types**.
+The .NET base class libraries provide two XML serializers: [XmlSerializer](../introducing-xml-serialization.md) and [DataContractSerializer](../../../fundamentals/runtime-libraries/system-runtime-serialization-datacontractserializer.md). There are some subtle differences between these two, but for the purpose of the migration, this section focuses only on `DataContractSerializer`. Why? Because it **fully supports the serialization programming model that was used by `BinaryFormatter`**. All the types that are already marked as `[Serializable]` or implement `ISerializable` can be serialized with `DataContractSerializer`. Where is the catch? Known types must be specified up front. You need to know them and be able to get the `Type`, **even for private types**.
 
 It's not required to specify most popular collections or primitive types like `string` or `DateTime` (the serializer has its own default allow-list), but there are exceptions like `DateTimeOffset`. For more information about the supported types, see [Types supported by the data contract serializer](../../../framework/wcf/feature-details/types-supported-by-the-data-contract-serializer.md).