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://Images.txt] FROM [Images] WHERE FolderName = 'New Folder'

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://Images.txt;delimiter=tab] FROM [Images] WHERE FolderName = 'New Folder'

C#

String connectionString = "OAuthClientId=MyOAuthClientId;OAuthClientSecret=MyOAuthClientSecret;CallbackURL=http://localhost:80";

using (ActOnConnection connection = new ActOnConnection(connectionString)) {
  ActOnCommand cmd = new ActOnCommand("SELECT Id, Name INTO [csv://Images.txt] FROM [Images] WHERE FolderName = 'New Folder' ", connection);
  int rowsAffected = cmd.ExecuteNonQuery();
} 

VB.NET

Dim connectionString As [String] = "OAuthClientId=MyOAuthClientId;OAuthClientSecret=MyOAuthClientSecret;CallbackURL=http://localhost:80" 

Using connection As New ActOnConnection(connectionString)
  Dim cmd As New ActOnCommand("SELECT Id, Name INTO [csv://Images.txt] FROM [Images] WHERE FolderName = 'New Folder'", 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 = "OAuthClientId=MyOAuthClientId;OAuthClientSecret=MyOAuthClientSecret;CallbackURL=http://localhost:80";

using (ActOnConnection connection = new ActOnConnection(connectionString)) {
  ActOnCommand cmd = new ActOnCommand("SELECT * INTO [Images] IN [csv://filename=c:/Images.csv;delimiter=tab] FROM [Images] WHERE FolderName = 'New Folder'", connection);
  int rowsAffected = cmd.ExecuteNonQuery();
} 

VB.NET

Dim connectionString As [String] = "OAuthClientId=MyOAuthClientId;OAuthClientSecret=MyOAuthClientSecret;CallbackURL=http://localhost:80" 

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