You can use the SELECT INTO statement to export formatted data to a file.

Data Export with an SQL Query

The following query exports data into a file formatted in comma-separated values (CSV):

SELECT Id, Name INTO [csv://Categories.txt] FROM [Categories] WHERE Id = '1668776136772254'

You can specify other formats in the file URI. The possible delimiters are tab, semicolon, and comma with the default being a comma. The following example exports tab-separated values:

SELECT Id, Name INTO [csv://Categories.txt;delimiter=tab] FROM [Categories] WHERE Id = '1668776136772254'

C#

String connectionString = "URL=http://www.yourwordpresshost.com;User=yourUsername;Password=yourPassword;";

using (WordpressConnection connection = new WordpressConnection(connectionString)) {
  WordpressCommand cmd = new WordpressCommand("SELECT Id, Name INTO [csv://Categories.txt] FROM [Categories] WHERE Id = '1668776136772254' ", connection);
  int rowsAffected = cmd.ExecuteNonQuery();
} 

VB.NET

Dim connectionString As [String] = "URL=http://www.yourwordpresshost.com;User=yourUsername;Password=yourPassword;" 

Using connection As New WordpressConnection(connectionString)
  Dim cmd As New WordpressCommand("SELECT Id, Name INTO [csv://Categories.txt] FROM [Categories] WHERE Id = '1668776136772254'", connection)
  Dim rowsAffected As Integer = cmd.ExecuteNonQuery()
End Using

You can specify other file formats in the URI. The following example exports tab-separated values:

C#

String connectionString = "URL=http://www.yourwordpresshost.com;User=yourUsername;Password=yourPassword;";

using (WordpressConnection connection = new WordpressConnection(connectionString)) {
  WordpressCommand cmd = new WordpressCommand("SELECT * INTO [Categories] IN [csv://filename=c:/Categories.csv;delimiter=tab] FROM [Categories] WHERE Id = '1668776136772254'", connection);
  int rowsAffected = cmd.ExecuteNonQuery();
} 

VB.NET

Dim connectionString As [String] = "URL=http://www.yourwordpresshost.com;User=yourUsername;Password=yourPassword;" 

Using connection As New WordpressConnection(connectionString)
  Dim cmd As New WordpressCommand("SELECT * INTO [Categories] IN [csv://filename=c:/Categories.csv;delimiter=tab] FROM [Categories] WHERE Id = '1668776136772254'", connection)
  Dim rowsAffected As Integer = cmd.ExecuteNonQuery()
End Using