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, Email INTO [csv://Leads.txt] FROM [Leads] WHERE Email = 'sample@email.com'

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, Email INTO [csv://Leads.txt;delimiter=tab] FROM [Leads] WHERE Email = 'sample@email.com'

C#

String connectionString = "Schema=REST;RESTEndpoint=https://MyMarketoUrl/rest;OAuthClientId=MyOAuthClientId;OAuthClientSecret=MyOAuthClientSecret;";

using (MarketoConnection connection = new MarketoConnection(connectionString)) {
  MarketoCommand cmd = new MarketoCommand("SELECT Id, Email INTO [csv://Leads.txt] FROM [Leads] WHERE Email = 'sample@email.com' ", connection);
  int rowsAffected = cmd.ExecuteNonQuery();
} 

VB.NET

Dim connectionString As [String] = "Schema=REST;RESTEndpoint=https://MyMarketoUrl/rest;OAuthClientId=MyOAuthClientId;OAuthClientSecret=MyOAuthClientSecret;" 

Using connection As New MarketoConnection(connectionString)
  Dim cmd As New MarketoCommand("SELECT Id, Email INTO [csv://Leads.txt] FROM [Leads] WHERE Email = 'sample@email.com'", 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 = "Schema=REST;RESTEndpoint=https://MyMarketoUrl/rest;OAuthClientId=MyOAuthClientId;OAuthClientSecret=MyOAuthClientSecret;";

using (MarketoConnection connection = new MarketoConnection(connectionString)) {
  MarketoCommand cmd = new MarketoCommand("SELECT * INTO [Leads] IN [csv://filename=c:/Leads.csv;delimiter=tab] FROM [Leads] WHERE Email = 'sample@email.com'", connection);
  int rowsAffected = cmd.ExecuteNonQuery();
} 

VB.NET

Dim connectionString As [String] = "Schema=REST;RESTEndpoint=https://MyMarketoUrl/rest;OAuthClientId=MyOAuthClientId;OAuthClientSecret=MyOAuthClientSecret;" 

Using connection As New MarketoConnection(connectionString)
  Dim cmd As New MarketoCommand("SELECT * INTO [Leads] IN [csv://filename=c:/Leads.csv;delimiter=tab] FROM [Leads] WHERE Email = 'sample@email.com'", connection)
  Dim rowsAffected As Integer = cmd.ExecuteNonQuery()
End Using