Any difference between :param and @param?

[h1112918]

There are two ways to add parameters:

command.CommandText = "SELECT * FROM mytable WHERE Id = :Id";
command.Parameters.AddWithValue("Id", id);

and

command.CommandText = "SELECT * FROM mytable WHERE Id = @Id";
command.Parameters.AddWithValue("@Id", id);

Is there any difference in both methods in performance or something else? I also think the difference (if any) should be mentioned in the project Wiki.

[roji]

There are no differences whatsoever between the two, Npgsql parses the command text and replaces them with PostgreSQL's native parameter placeholders, which are positional and not named ($1, $2).