ODBC connect string for SQLEXPRESS

I can not open SQLExpress using ODBC.
The 1st Open works using the native drivers.
The second open always fails using ODBC.
I have tried all sorts of syntax changes.

     string s1 =@"Data Source=HOME\SQLEXPRESS;Initial Catalog=TESTDB;Integrated Security=True";
            SqlConnection connSQL = new SqlConnection(s1);
            connSQL.Open(); //<<this works

            string s2 = @"Provider=SQLOLEDB.1;Data Source=C:\Program Files\Microsoft SQL Server\MSSQL.1\MSSQL\Data\;Initial catalog=TESTDB; Trusted_connection=yes;";
            OleDbConnection connODBC = new OleDbConnection(s2);
            connODBC.Open(); //this fails with - Message="[DBNETLIB][ConnectionOpen (ParseConnectParams()).]Invalid connection."
wilfordrocksAsked:
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Guy Hengel [angelIII / a3]Billing EngineerCommented:
please try this instead:
string s2 = @"Provider=SQLOLEDB.1;Data Source=.;Initial catalog=TESTDB; Trusted_connection=yes;";

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brad2575Commented:
does your database allow non windows authentication connection?

You can right click the database (from sql server environment) and then click Properties and then security and there is an option in there for windows authentication or SQL authentication and windows

that would be what I would check first.
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wilfordrocksAuthor Commented:
It is set to Windows Authentication by default.  Switching it does not help.
Thanks anyway.
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wilfordrocksAuthor Commented:
You rock my friend.
This string, based on yours, works!
            string s2 = @"Provider=SQLOLEDB.1;Data Source=HOME\SQLEXPRESS;Initial catalog=TESTDB; Trusted_connection=yes;";
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