Help!  I'm unable to connect to my SQL Server 2005 database from a C#
class.

This error message happens on the conn.Open() statement in my code:
Request for the permission of type
'System.Data.SqlClient.SqlClientPermission, System.Data,
Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089'
failed.

I have VS 2005 and Sql Server 2005 installed on my dev workstation.
I'm running the code in the debugger and I get the above error.  I have
tried a variety of connect strings - many more than listed here but
none worked so far.  All works fine from SQL Server 2005 Management
Studio.  I created a Integrated Services package, compiled and it runs
without a hitch.  VS can connect to the database fine.
TCPIP was enabled and I also enabled Named Pipes - no change.

Can anybody help me understand what I need to do to be able to connect
from code?

using System;
using System.Collections.Generic;
using System.Text;
using System.Data;
using System.Data.SqlClient;

<snip>
                   cs = "Data Source=(local);Initial
Catalog=ScoreCard;Integrated Security=True";
                   cs = "Data Source=(local);Initial
Catalog=ScoreCard;Trusted_Connection=True";
                   cs = "Data Source=tcp:davel-vpc;Initial
Catalog=scorecard;User Id=someuser;Password=password;";
                   cs = "Data Source=myserver;Initial
Catalog=scorecard;User Id=someuser;Password=password";
<snip>

           DataTable dt = new DataTable();
           using ( SqlConnection conn = new SqlConnection(cs) )
Catalog=ScoreCard;Integrated Security=True"))
           using (SqlCommand cmd = new SqlCommand("GetCities",conn))
           {
               cmd.CommandText = "SELECT * FROM city";
               conn.Open();

               <snip>
               conn.Close();
           }

Targus.