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, Address INTO [csv://ByName.txt] FROM [ByName] WHERE City = 'Miami'

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, Address INTO [csv://ByName.txt;delimiter=tab] FROM [ByName] WHERE City = 'Miami'

C#

String connectionString = "Server=https://domino.corp.com;Database=names.nsf;Port=3002;SSLClientCertType=PEMKEY_FILE;SSLClientCert=full_path_of_certificate.pem;SSLServerCert=*";

using (DominoConnection connection = new DominoConnection(connectionString)) {
  DominoCommand cmd = new DominoCommand("SELECT Name, Address INTO [csv://ByName.txt] FROM [ByName] WHERE City = 'Miami' ", connection);
  int rowsAffected = cmd.ExecuteNonQuery();
} 

VB.NET

Dim connectionString As [String] = "Server=https://domino.corp.com;Database=names.nsf;Port=3002;SSLClientCertType=PEMKEY_FILE;SSLClientCert=full_path_of_certificate.pem;SSLServerCert=*" 

Using connection As New DominoConnection(connectionString)
  Dim cmd As New DominoCommand("SELECT Name, Address INTO [csv://ByName.txt] FROM [ByName] WHERE City = 'Miami'", 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 = "Server=https://domino.corp.com;Database=names.nsf;Port=3002;SSLClientCertType=PEMKEY_FILE;SSLClientCert=full_path_of_certificate.pem;SSLServerCert=*";

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

VB.NET

Dim connectionString As [String] = "Server=https://domino.corp.com;Database=names.nsf;Port=3002;SSLClientCertType=PEMKEY_FILE;SSLClientCert=full_path_of_certificate.pem;SSLServerCert=*" 

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