Multiple sql commands in one single connection C#

I have to run different sql statement in one connection may be 5-6. Example:

1. Checking some condition in a table.
2. Updating another table on the basis of value received from first command.
3. Inserting new data to some other table on the basis of result of first command.

All of the command contains parameterized query.

This is how I am approaching to it. Is is good approach? Does this create multiple round trips to database? Or am I wrong on round trips. Please suggest me on this.

using (NpgsqlConnection connection = new NpgsqlConnection (connectionString))
{
    connection.Open();
    using (NpgsqlCommand command1 = new NpgsqlCommand (commandText1, connection))
    {
      //select
    }
    using (NpgsqlCommand command2 = new NpgsqlCommand (commandText2, connection))
    {
      //update
    }
    // etc
}