# IDataSource.Delete()

Description:

The `Delete` method deletes a landmark or landmark category from a landmark database.

Note: You cannot delete landmark databases.

This is a synchronous method.

Syntax:

    result = so.IDataSource.Delete(criteria);

Arguments:

- `criteria`:

  This is an object that specifies the landmark or landmark category to delete. For more information about the object properties and how to define them, see section Criteria for deleting landmark information.

Return value:

The `Delete` method returns an object that contains an error code and an error message.

Table: Return value properties for Delete
Property | Description | Value
--- | --- | ---
`result.ErrorCode` | This is a number that specifies a predefined error code. | See Service API error codes.
`result.ErrorMessage` | This is a text string that describes the error. | See Landmarks Service API error messages.

Remarks:

- If no landmark database is specified, `Delete` is performed on the default database. If the default database does not exist, it is created and set active, but no delete operation is performed. The default database is `file://c:eposlm.ldb`.

- For more information about landmarks, landmark categories, and landmark databases, see the Landmarks Service overview page.

Example code:

For the complete source of a sample widget that demonstrates how to use this Service API, see the full example.