Kind of Important. Connection String

I am having a problem getting into SQL 2005.
My connection string is as follows:

using System.Data.OleDb;

OleDbConnection conn = new OleDbConnection(@."Provider=SqlOleDb;Data Source=Orange;Initial Catalog=Test;");
//tried with taking out comma after Test as well.

I have tried a lot of different permutations here and I cannot get this to work.Don't post a question about an error without posting the error message.|||Is there a good reason you are using OleDB? SQLClient is optimised for SQL Server.

http://www.connectionstrings.com/sql