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):

C#

String connectionString = "InitiateOAuth=GETANDREFRESH;";

using (GoogleContactsConnection connection = new GoogleContactsConnection(connectionString)) {
  GoogleContactsCommand cmd = new GoogleContactsCommand("SELECT Id, Fullname INTO [csv://[My Contacts].txt] FROM [[My Contacts]] WHERE Updated = '2017-03-15' ", connection);
  int rowsAffected = cmd.ExecuteNonQuery();
} 

VB.NET

Dim connectionString As [String] = "InitiateOAuth=GETANDREFRESH;" 

Using connection As New GoogleContactsConnection(connectionString)
  Dim cmd As New GoogleContactsCommand("SELECT Id, Fullname INTO [csv://[My Contacts].txt] FROM [[My Contacts]] WHERE Updated = '2017-03-15'", 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 = "InitiateOAuth=GETANDREFRESH;";

using (GoogleContactsConnection connection = new GoogleContactsConnection(connectionString)) {
  GoogleContactsCommand cmd = new GoogleContactsCommand("SELECT * INTO [[My Contacts]] IN [csv://filename=c:/[My Contacts].csv;delimiter=tab] FROM [[My Contacts]] WHERE Updated = '2017-03-15'", connection);
  int rowsAffected = cmd.ExecuteNonQuery();
} 

VB.NET

Dim connectionString As [String] = "InitiateOAuth=GETANDREFRESH;" 

Using connection As New GoogleContactsConnection(connectionString)
  Dim cmd As New GoogleContactsCommand("SELECT * INTO [[My Contacts]] IN [csv://filename=c:/[My Contacts].csv;delimiter=tab] FROM [[My Contacts]] WHERE Updated = '2017-03-15'", connection)
  Dim rowsAffected As Integer = cmd.ExecuteNonQuery()
End Using