Dynamic Connection EF C # Windows Forms Mysql

After much searching and analysis I was able to solve the problem. As described in update 3 I found a method to change the xml file of app.config and I put below the code with the solution of the problem:

public void Servidor()
        {
            string _ipservidor = string.Empty;
            _ipservidor = LerIni.LerINI(@"C:\Motion Software\bin\config.ini", "[IPServidor]");
            connectionString = "metadata=res://*/ModeloDados.csdl|res://*/ModeloDados.ssdl|res://*/ModeloDados.msl;provider=MySql.Data.MySqlClient;provider connection string='server="+_ipservidor+";user id=sa;password=master;persistsecurityinfo=True;database=ref_bd'";
            updateConfigFile(connectionString);

            /* Altera app.config */
            Configuration config = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
            config.ConnectionStrings.ConnectionStrings["ref_bdEntities"].ConnectionString = connectionString;
            config.Save(ConfigurationSaveMode.Modified); // Salva o que foi modificado
            ConfigurationManager.RefreshSection("connectionStrings"); // Atualiza no app o bloco connectionStrings
            Properties.Settings.Default.Reload(); // Recarrega os dados de conexão   

            /* Altera connection Entity Framework */
            EntityConnectionStringBuilder conEntity = new EntityConnectionStringBuilder();
            conEntity.Provider = "MySql.Data.MySqlClient";
            conEntity.ProviderConnectionString = "'server=" + _ipservidor + ";user id=sa;password=master;persistsecurityinfo=True;database=ref_bd'";
            conEntity.Metadata = "res://*/Modelo.csdl|res://*/Modelo.ssdl|res://*/Modelo.msl";
            ref_bdEntities BDEntidades = new ref_bdEntities(conEntity.ToString());
        }

        public void updateConfigFile(string con)
        {
            XmlDocument xmlDoc = new XmlDocument();
            xmlDoc.Load(AppDomain.CurrentDomain.SetupInformation.ConfigurationFile);
            foreach (XmlElement xElement in xmlDoc.DocumentElement)
            {
                if (xElement.Name == "connectionStrings")
                {
                    xElement.FirstChild.Attributes[1].Value = con;
                }

            }
            xmlDoc.Save(AppDomain.CurrentDomain.SetupInformation.ConfigurationFile);
        }

As you can see, I also updated the configuration and EntityConnection. This was just to make sure it would work, if anyone thinks they will have a performance drop please let me know.

But what really ended with my problem was to change the value of the connectionString in the xml of the app.config, I tested it in a separate folder with the Menu.exe.config and it worked.

The only problem I noticed is that as I was testing with the local machine ip 127.0.0.1, changing only the last number to any other it continued to connect but I think this happens because of port 3306, but when placing a different ip type 192.168.12.145 it does not find the same port then the connection error.

Any suggestions you have and would like to share with me, thank you!

Thanks for your attention.

Basically, when I initialize the application I make a small query in the version table of my system, if this query attempt is error, it is certainly connectivity problem, so I call a dialog so that the address is set and record: -)

        public static bool Configura(string strConecta, out string newStrConecta)
    {
        var builder = new SqlConnectionStringBuilder
        {
            ConnectionString = strConecta
        };
        newStrConecta = "";
        using (var bancoForm = new BancoForm())
        {
            bancoForm.tbServidor.Text = builder.DataSource;
            bancoForm.tbUsuario.Text = builder.UserID;
            bancoForm.tbPassword.Text = builder.Password;
            bancoForm.tbDatabase.Text = builder.InitialCatalog;
            var result = bancoForm.ShowDialog();
            if (result != DialogResult.OK)
            {
                Debug.WriteLine("\n\nFALHOU : " + strConecta + "\n\t");
                return false;
            }
            else
            {
                builder.DataSource = bancoForm.tbServidor.Text;
                builder.UserID = bancoForm.tbUsuario.Text;
                builder.Password = bancoForm.tbPassword.Text;
                builder.InitialCatalog = bancoForm.tbDatabase.Text;
                newStrConecta = builder.ConnectionString;
                Debug.WriteLine("\n\tSUCESSO !!! \n\t");
                Debug.WriteLine("Sucesso", newStrConecta);

                return true;
            }
        }
    }

It works very well for me.