我是一个相当新的开发人员，目前正在开发一个c#程序，该程序使用以下代码连接到mysql服务器：

class MySql
{
    private MySqlConnection connection;
    private string server;
    private string database;
    private string uid;
    private string password;

    //Constructor
    public MySql()
    {
        Initialize();
    }

    //Initialize values
    private void Initialize()
    {
        server = "mydomain.com";
        database = "dbName";
        uid = "Username";
        password = "Password";
        string connectionString;
        connectionString = "SERVER=" + server + ";" + "DATABASE=" +
        database + ";" + "UID=" + uid + ";" + "PASSWORD=" + password + ";";

        connection = new MySqlConnection(connectionString);
    }

    //open connection to database
    private bool OpenConnection()
    {
        try
        {
            connection.Open();
            return true;
        }
        catch (MySqlException ex)
        {
            //When handling errors, you can your application's response based 
            //on the error number.
            //The two most common error numbers when connecting are as follows:
            //0: Cannot connect to server.
            //1045: Invalid user name and/or password.
            switch (ex.Number)
            {
                case 0:
                    MessageBox.Show("Cannot connect to server.  Contact administrator");
                    break;

                case 1045:
                    MessageBox.Show("Invalid username/password, please try again");
                    break;
            }
            return false;
        }
    }

    //Close connection
    private bool CloseConnection()
    {
        try
        {
            connection.Close();
            return true;
        }
        catch (MySqlException ex)
        {
            MessageBox.Show(ex.Message);
            return false;
        }
    }

现在我不太清楚如何安全地保存服务器登录。如您所见，在我的代码中，域、用户名和密码只是公开地存在于代码中。
据我所知，不应该是这样。
我该怎么纠正呢？或者像那样储存是省钱吗？谢谢！