C#

...
MySqlConnection connection = new MySqlConnection(MyConString);

try {
   connection.Open();
   System.Windows.Forms.MessageBox.Show(this, "Connection state is now " + connection.State);
   connection.Close();
} catch (System.Exception exception) { // or preferrably derived class for MySql exception instead of System.Exception
   System.Windows.Forms.MessageBox.Show(this, "Connection failed:\n\n" + exception.Message);
} finally {
   this.Close();
}

foreach(Control control in this.Controls)
{
    MessageBox.Show(control.Name);
}

delegete void SetMyTextBoxCallback(string text);

public void SetMyTextBox(string text)
{
  if (textBox1.InvokeRequired)
  {
      SetMyTextBoxCallback d = new SetMyTextBoxCallback(SetMyTextBox);
this.Invoke(d, new object[] {text});
  }
  else
  {
textBox1.Text = text + Environment.NewLine + textBox1.Text;
Application.DoEvents();
  }
}

dhaim
program is hobby that make some money as side effect