using (SqlConnection connection = New SqlConnection(connectionString))
{ string queryString = "BULK INSERT Northwind.dbo.[Order Details] " + "FROM 'f:\mydata\data.tbl' " + "WITH ( FORMATFILE='f:\mydata\data.fmt' )";
connection.Open();
SqlCommand command = new SqlCommand(queryString, connection);

command.ExecuteNonQuery();
}