Using SQLDMO to list available SQL Server 2000 DBs

Question

I'm trying to put together an app where I'm first using SQLDMO to get a list of available SQL Servers on a network, then trying to use it to connect to a chosen server and retrieve a list of the available DBs.

I'm completely new to C#, and my knowledge of SQL Server is beginner/intermediate level, so the code I do have is taken from an existing tutorial. However, while I'm able to locate the server on the (non-existent) network, I'm unable to connect to the SQL Server to get a list of the available DBs.

I'm currently trying to get this working on a single machine with a named instance of SQL Server, but I'm just not able to create a connection to the server. SQL Server is set to use Windows Authentication, and my user account is set up in SQL Server as a trusted account. However, the app returns an error message of:

[Microsoft][ODBC SQL Server Driver][SQL Server]Login failed for user 'foo'.

The code in question looks like this:
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SQLDMO.SQLServer srv = new SQLDMO.SQLServerClass();
srv.Connect(this.cmbServer.SelectedItem.ToString(),this.txtUser.Text,this.txtPassword.Text);
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cmbServer.SelectedItem does contain the named instance of SQL Server 'FOO\BAR'

I have also tried not passing the username and password, as I thought I had a trusted connection, but obviously this is not the case. Can anyone point me in the right direction?