LinqToSql Plus Key

AllowDuplicateKeys

Gets or sets if a duplicate key is possible in the source.

context.BulkMerge(options => options.AllowDuplicateKeys = true);

AllowUpdatePrimaryKeys

Gets or sets if the key must also be included in columns to UPDATE.

context.BulkMerge(options => options.AllowUpdatePrimaryKeys = true);