Cannot test connection to mysql

Question

Error message: "Unable to connect to any specified MySQL hosts" when i click on btn_Test. Im definitely entering a valid serverName and DatabaseName.

public partial class MainForm : Form
{

   public static string serverName;
   public static string database;

   public MainForm()
   {
         InitializeComponent();
   }

   MySqlConnection connection = new MySqlConnection("server=" + serverName + ";    Database=" + database + "; username=username; password=password");

   public void btnTest_Click(object sender, EventArgs e)
   {
         serverName = txtServer.Text;
         database = txtDatabase.Text;

   try
   {
         connection.Open();
         MessageBox.Show("Connected!");
   }
   catch (Exception ex)
   {
         MessageBox.Show(ex.Message);

   }
}