Going crazy comparing bytea columns

Hi,
I am new to Postgresql, so pls be patient.

I am using npgsql with C# to insert a bytea value into a
column which will serve as an encrypted password. This works
well. However, when I retrieve the value, it is different.
In other words, "select pwd from table where pwd like @pwd"
does not work.

Is it not possible to compare bytea columns?

...get dbConn...

NpgsqlCommand cmd = new NpgsqlCommand("select pwd from table
where usr = @usr and pwd like @pwd",dbConn);
cmd.Parameters.Add(new NpgsqlParameter("usr",DbType.String);
cmd.Parameters.Add(new
NpgsqlParameter("pwd",NpgsqlTypes.NpgsqlDbType.Bytea);
cmd.prepare()
... set param values, call executereader...

Thanks,

JM

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