I'm writing a C# application to add subscribers to wordpress. The problem I'm having is the user_nicename and display_name fields in the database are showing but in the WordPress Users interface the Nickname is blank and there is a blank section in the Display name publicly as field. What am I missing?

Thanks

 ds = new DataSet();
 userAdapter = new MySqlDataAdapter("INSERT INTO `wp_users` (`ID`, `user_login`, `user_pass`, `user_nicename`, `user_email`, `user_url`, `user_registered`, `user_activation_key`, `user_status`, `display_name`, `coop_statementDate`, `coop_current_acc`, `coop_reimb_cred`, `coop_fund_bal`) VALUES(NULL, '"+txtLoginName.Text+"', MD5('{"+txtPassword.Text+"}'), '"+txtLoginName.Text+"', '"+txtEmail.Text+"', '', '0000-00-00 00:00:00.000000', '', '0', '"+txtCompanyName.Text+ "', '', '', '', '');", conn);
 userAdapter.Fill(ds,"wp_users");