static void Main()
{
    DbConnectionStringBuilder builder =
        new DbConnectionStringBuilder();
    builder.ConnectionString = @"Data Source=c:\MyData\MyDb.mdb";
    builder.Add("Provider", "Microsoft.Jet.Oledb.4.0");
    builder.Add("Jet OLEDB:Database Password", "*******");
    builder.Add("Jet OLEDB:System Database",
        @"c:\MyData\Workgroup.mdb");
    // Set up row-level locking.
    builder.Add("Jet OLEDB:Database Locking Mode", 1);

    // The DbConnectionStringBuilder class 
    // is database agnostic, so it's possible to 
    // build any type of connection string using 
    // this class.

    // The ConnectionString property may have been 
    // formatted by the DbConnectionStringBuilder class.
    OleDbConnection oledbConnect = new
        OleDbConnection(builder.ConnectionString);
    Console.WriteLine(oledbConnect.ConnectionString);

    // Use the same DbConnectionStringBuilder to create 
    // a SqlConnection object.
    builder.Clear();
    builder.Add("integrated security", true);
    builder.Add("Initial Catalog", "AdventureWorks");
    builder.Add("Data Source", "(local)");

    SqlConnection sqlConnect = new
        SqlConnection(builder.ConnectionString);
    Console.WriteLine(sqlConnect.ConnectionString);

    // Pass the DbConnectionStringBuilder an existing 
    // connection string, and you can retrieve and
    // modify any of the elements.
    builder.ConnectionString = "server=(local);user id=*******;" +
        "password=*******;initial catalog=AdventureWorks";
    builder["Server"] = ".";
    builder.Remove("User ID");

    // Note that calling Remove on a nonexistent item doesn't
    // throw an exception.
    builder.Remove("BadItem");

    // Setting the indexer adds the value if 
    // necessary.
    builder["Integrated Security"] = true;
    builder.Remove("password");
    builder["User ID"] = "Hello";
    Console.WriteLine(builder.ConnectionString);

    Console.WriteLine("Press Enter to finish.");
    Console.ReadLine();
}