public static void Initialize()

/// <summary>
  /// The main entry point for the application, responsible for initializing the ArcGIS Core Host.
  /// </summary>
  /// <remarks>This method must be marked with the <see cref="STAThreadAttribute"/> to ensure proper
  /// threading model. It initializes the ArcGIS Core Host, which is required before constructing any objects from the
  /// ArcGIS.Core namespace. If initialization fails, an error message is displayed and the application
  /// exits.</remarks>
  /// <param name="args">Command-line arguments passed to the application.</param>
  //[STAThread] must be present on the Application entry point
  [STAThread]
  static void Main(string[] args)
  {
    //Call Host.Initialize before constructing any objects from ArcGIS.Core
    try
    {
      Host.Initialize();
    }
    catch (Exception e)
    {
      // Error (missing installation, no license, 64 bit mismatch, etc.)
      Console.WriteLine(string.Format("Initialization failed: {0}", e.Message));
      return;
    }

    //if we are here, ArcGIS.Core is successfully initialized
    Geodatabase gdb = new(new FileGeodatabaseConnectionPath(new Uri(@"C:\Data\SDK\GDB\MySampleData.gdb")));
    IReadOnlyList<TableDefinition> definitions = gdb.GetDefinitions<FeatureClassDefinition>();

    foreach (var fdsDef in definitions)
    {
      Console.WriteLine(TableString(fdsDef as TableDefinition));
    }
    Console.Read();
  }

  private static string TableString(TableDefinition table)
  {
    string alias = table.GetAliasName();
    string name = table.GetName();
    return string.Format("{0} ({1})", alias.Length > 0 ? alias : name, name);
  }
}