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Showing content from https://learn.microsoft.com/en-us/dotnet/api/system.data.services.client.mergeoption below:

MergeOption Enum (System.Data.Services.Client) | Microsoft Learn

MergeOption Enum Definition

Determines the synchronization option for sending or receiving entities to or from WCF Data Services.

public enum class MergeOption

public enum MergeOption

type MergeOption =

Public Enum MergeOption

Inheritance

Fields Name Value Description AppendOnly 0

Append new entities only. Existing entities or their original values will not be modified. No client-side changes are lost in this merge. This is the default behavior.

OverwriteChanges 1

All current values on the client are overwritten with current values from the data service regardless of whether they have been changed on the client.

PreserveChanges 2

Current values that have been changed on the client are not modified, but any unchanged values are updated with current values from the data service. No client-side changes are lost in this merge.

NoTracking 3

Objects are always loaded from persisted storage. Any property changes made to objects in the object context are overwritten by the data source values.

This value is used when materializing objects. Set this property to the appropriate materialization option before executing any queries or updates to the data service. The default value is MergeOption.AppendOnly.