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 MANDT, MATNR INTO [csv://MARA.txt] FROM [MARA] WHERE ERNAM = 'BEHRMANN'

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 MANDT, MATNR INTO [csv://MARA.txt;delimiter=tab] FROM [MARA] WHERE ERNAM = 'BEHRMANN'

C#

String connectionString = "Host=sap.mydomain.com;User=EXT90033;Password=xxx;Client=800;System Number=09;ConnectionType=Classic;";

using (SAPERPConnection connection = new SAPERPConnection(connectionString)) {
  SAPERPCommand cmd = new SAPERPCommand("SELECT MANDT, MATNR INTO [csv://MARA.txt] FROM [MARA] WHERE ERNAM = 'BEHRMANN' ", connection);
  int rowsAffected = cmd.ExecuteNonQuery();
} 

VB.NET

Dim connectionString As [String] = "Host=sap.mydomain.com;User=EXT90033;Password=xxx;Client=800;System Number=09;ConnectionType=Classic;" 

Using connection As New SAPERPConnection(connectionString)
  Dim cmd As New SAPERPCommand("SELECT MANDT, MATNR INTO [csv://MARA.txt] FROM [MARA] WHERE ERNAM = 'BEHRMANN'", 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 = "Host=sap.mydomain.com;User=EXT90033;Password=xxx;Client=800;System Number=09;ConnectionType=Classic;";

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

VB.NET

Dim connectionString As [String] = "Host=sap.mydomain.com;User=EXT90033;Password=xxx;Client=800;System Number=09;ConnectionType=Classic;" 

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