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 Name, Contact_Company INTO [csv://Lists.txt] FROM [Lists] WHERE  = ''

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 Name, Contact_Company INTO [csv://Lists.txt;delimiter=tab] FROM [Lists] WHERE  = ''

C#

String connectionString = "APIKey=myAPIKey;";

using (MailChimpConnection connection = new MailChimpConnection(connectionString)) {
  MailChimpCommand cmd = new MailChimpCommand("SELECT Name, Contact_Company INTO [csv://Lists.txt] FROM [Lists] WHERE  = '' ", connection);
  int rowsAffected = cmd.ExecuteNonQuery();
} 

VB.NET

Dim connectionString As [String] = "APIKey=myAPIKey;" 

Using connection As New MailChimpConnection(connectionString)
  Dim cmd As New MailChimpCommand("SELECT Name, Contact_Company INTO [csv://Lists.txt] FROM [Lists] WHERE  = ''", 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 = "APIKey=myAPIKey;";

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

VB.NET

Dim connectionString As [String] = "APIKey=myAPIKey;" 

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