program.cs from right code pane for jules

program.cs

using System.Threading; // Added
using System.Windows.Forms; // Ensure this is present for MessageBox

namespace TextToSpeechApp
{
    internal static class Program
    {
        /// <summary>
        ///  The main entry point for the application.
        /// </summary>
        [STAThread]
        static void Main()
        {
            // Unique name for the Mutex. Using a GUID is a common way to ensure uniqueness.
            const string appMutexName = "TextToSpeechApp_Mutex_C9A3F5E1-A5F8-4B2E-8D6F-7E3A0B4C1D7E";
            bool createdNew;
            
            Mutex mutex = new Mutex(true, appMutexName, out createdNew);

            if (!createdNew)
            {
                // Another instance is already running.
                MessageBox.Show("TextToSpeechApp is already running. Please close the existing instance.", 
                                "Application Already Running", 
                                MessageBoxButtons.OK, 
                                MessageBoxIcon.Information);
                return; // Exit the new instance
            }

            // To customize application configuration such as set high DPI settings or default font,
            // see https://aka.ms/applicationconfiguration.
            ApplicationConfiguration.Initialize(); // Or Application.EnableVisualStyles(); etc.
            
            try
            {
                Application.Run(new Form1());
            }
            finally
            {
                // Release the Mutex when the application exits.
                // This is crucial if this instance was the one that created the Mutex.
                mutex.ReleaseMutex();
                mutex.Dispose(); // Dispose the mutex object itself
            }
        }
    }
}