gistfile1.cs

    public class MyConnectionProvider : DriverConnectionProvider
    {
        private string server;
        private string password;
        private string userName;

        protected override string ConnectionString
        {
            get
            {
                var original = base.ConnectionString;
                var newConnectionString = original
                    .Replace("[Server]", server)
                    .Replace("[Username]", userName)
                    .Replace("[Password]", password);

                return newConnectionString;
            }
        }
       
        public void SetNewCredentials(string newUserName, string newPassword, string newServer)
        {
            userName = newUserName;
            password = newPassword;
            server = newServer;
        }
    }