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 RowId, LastName INTO [csv://Sheet.txt] FROM [Sheet] WHERE FirstName = 'Bob'

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 RowId, LastName INTO [csv://Sheet.txt;delimiter=tab] FROM [Sheet] WHERE FirstName = 'Bob'

C#

String connectionString = "URI=C:\MyExcelWorkbooks\SampleWorkbook.xlsx;";

using (ExcelConnection connection = new ExcelConnection(connectionString)) {
  ExcelCommand cmd = new ExcelCommand("SELECT RowId, LastName INTO [csv://Sheet.txt] FROM [Sheet] WHERE FirstName = 'Bob' ", connection);
  int rowsAffected = cmd.ExecuteNonQuery();
} 

VB.NET

Dim connectionString As [String] = "URI=C:\MyExcelWorkbooks\SampleWorkbook.xlsx;" 

Using connection As New ExcelConnection(connectionString)
  Dim cmd As New ExcelCommand("SELECT RowId, LastName INTO [csv://Sheet.txt] FROM [Sheet] WHERE FirstName = 'Bob'", 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 = "URI=C:\MyExcelWorkbooks\SampleWorkbook.xlsx;";

using (ExcelConnection connection = new ExcelConnection(connectionString)) {
  ExcelCommand cmd = new ExcelCommand("SELECT * INTO [Sheet] IN [csv://filename=c:/Sheet.csv;delimiter=tab] FROM [Sheet] WHERE FirstName <> 'Bob'", connection);
  int rowsAffected = cmd.ExecuteNonQuery();
} 

VB.NET

Dim connectionString As [String] = "URI=C:\MyExcelWorkbooks\SampleWorkbook.xlsx;" 

Using connection As New ExcelConnection(connectionString)
  Dim cmd As New ExcelCommand("SELECT * INTO [Sheet] IN [csv://filename=c:/Sheet.csv;delimiter=tab] FROM [Sheet] WHERE FirstName <> 'Bob'", connection)
  Dim rowsAffected As Integer = cmd.ExecuteNonQuery()
End Using