string serverName = "mysql.zzz.com.ua";
        string userName = "root";
        string dbName = "dbname";
        string port = "3306";
        string password = "pass";
        string connStr = "server=" + serverName +
            ";user=" + userName +
            ";database=" + dbName +
            ";port=" + port +
            ";password=" + password + ";";
        var connectionString = "server=" + serverName + ";" + "database=" + dbName + ";" + "uid=" + userName + ";" + "pwd=" + password + ";";


        MySqlConnection conn = new MySqlConnection(connStr);
        try
        {
            conn.Open();

        }
        catch (Exception ex)
        {
       MessageBox.Show(ex.ToString());
        }

> Возникло исключение "MySql.Data.MySqlClient.MySqlException" в
> MySql.Data.dll ("Authentication to host 'mysql.zzz.com.ua' for user
> 'root' using method 'mysql_native_password' failed with message:
> Logins are not allowed")  MySql.Data.MySqlClient.MySqlException