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 TaskId, startDateTime INTO [csv://Tasks.txt] FROM [Tasks] WHERE TaskId  = 'BCrvyMoiLEafem-3RxIESmUAHbLK'

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 TaskId, startDateTime INTO [csv://Tasks.txt;delimiter=tab] FROM [Tasks] WHERE TaskId  = 'BCrvyMoiLEafem-3RxIESmUAHbLK'

C#

String connectionString = "OAuthClientId=MyApplicationId;OAuthClientSecret=MySecretKey;CallbackURL=http://localhost:33333;";

using (MicrosoftPlannerConnection connection = new MicrosoftPlannerConnection(connectionString)) {
  MicrosoftPlannerCommand cmd = new MicrosoftPlannerCommand("SELECT TaskId, startDateTime INTO [csv://Tasks.txt] FROM [Tasks] WHERE TaskId  = 'BCrvyMoiLEafem-3RxIESmUAHbLK' ", connection);
  int rowsAffected = cmd.ExecuteNonQuery();
} 

VB.NET

Dim connectionString As [String] = "OAuthClientId=MyApplicationId;OAuthClientSecret=MySecretKey;CallbackURL=http://localhost:33333;" 

Using connection As New MicrosoftPlannerConnection(connectionString)
  Dim cmd As New MicrosoftPlannerCommand("SELECT TaskId, startDateTime INTO [csv://Tasks.txt] FROM [Tasks] WHERE TaskId  = 'BCrvyMoiLEafem-3RxIESmUAHbLK'", 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=MyApplicationId;OAuthClientSecret=MySecretKey;CallbackURL=http://localhost:33333;";

using (MicrosoftPlannerConnection connection = new MicrosoftPlannerConnection(connectionString)) {
  MicrosoftPlannerCommand cmd = new MicrosoftPlannerCommand("SELECT * INTO [Tasks] IN [csv://filename=c:/Tasks.csv;delimiter=tab] FROM [Tasks] WHERE TaskId  = 'BCrvyMoiLEafem-3RxIESmUAHbLK'", connection);
  int rowsAffected = cmd.ExecuteNonQuery();
} 

VB.NET

Dim connectionString As [String] = "OAuthClientId=MyApplicationId;OAuthClientSecret=MySecretKey;CallbackURL=http://localhost:33333;" 

Using connection As New MicrosoftPlannerConnection(connectionString)
  Dim cmd As New MicrosoftPlannerCommand("SELECT * INTO [Tasks] IN [csv://filename=c:/Tasks.csv;delimiter=tab] FROM [Tasks] WHERE TaskId  = 'BCrvyMoiLEafem-3RxIESmUAHbLK'", connection)
  Dim rowsAffected As Integer = cmd.ExecuteNonQuery()
End Using