Hi guys,
 
	I am so happy with the WPF C#  from Paul Templates and the DLL.
 
	Right now I am trying to write one value (Fuel in kgs) from my textbox (txtboxCenterTank.Text) to the Simulator.
 
	But I am struggling a bit.
 
	Do you guys have any hints ?
 
	Thanks 
 
	Patrick
 
public partial class MainWindow : Window
    {
        FsFuelTanksCollection fuelTanks = null;
       
        // Set up a main timer
        private DispatcherTimer timerMain = new DispatcherTimer();
        // And another to look for a connection
        private DispatcherTimer timerConnection = new DispatcherTimer();
        // =====================================
        // DECLARE OFFSETS YOU WANT TO USE HERE
        // =====================================
        private Offset<uint> airspeed = new Offset<uint>(0x02BC);
        
        public MainWindow()
        {
            InitializeComponent();
            configureForm();
            timerMain.Interval = TimeSpan.FromMilliseconds(50);
            timerMain.Tick += timerMain_Tick;
            timerConnection.Interval = TimeSpan.FromMilliseconds(1000);
            timerConnection.Tick += timerConnection_Tick;
            timerConnection.Start();
        }
        private void timerConnection_Tick(object sender, EventArgs e)
        {
            // Try to open the connection
            try
            {
                FSUIPCConnection.Open();
                // If there was no problem, stop this timer and start the main timer
                this.timerConnection.Stop();
                this.timerMain.Start();
                // Update the connection status
                configureForm();
            }
            catch
            {
                // No connection found. Don't need to do anything, just keep trying
            }
        }
        // This method runs 20 times per second (every 50ms). This is set in the form constructor above.
        private void timerMain_Tick(object sender, EventArgs e)
        {
            // Call process() to read/write data to/from FSUIPC
            // We do this in a Try/Catch block incase something goes wrong
            try
            {
                FSUIPCConnection.Process();
                // Update the information on the form
                // (See the Examples Application for more information on using Offsets).
                // 1. Airspeed
                double airspeedKnots = (double)this.airspeed.Value / 128d;
                this.txtAirspeed.Text = airspeedKnots.ToString("F0");
              
            }
            catch (Exception ex)
            {
                // An error occured. Tell the user and stop this timer.
                this.timerMain.Stop();
                MessageBox.Show("Communication with Aircraft Failed\n\n" + ex.Message, "FSUIPC", MessageBoxButton.OK, MessageBoxImage.Exclamation);
                // Update the connection status
                configureForm();
            }
        }
        // Configures the button and status label depending on if we're connected or not 
        private void configureForm()
        {
            if (FSUIPCConnection.IsOpen)
            {
                this.lblConnectionStatus.Text = "Connection to Aircraft established";
                this.lblConnectionStatus.Foreground = Brushes.Green;
            }
            else
            {
                this.lblConnectionStatus.Text = "Disconnected. Looking for Aircraft Connection...";
                this.lblConnectionStatus.Foreground = Brushes.Red;
            }
        }
        // Window closing so stop all the timers and close the connection
        private void Window_Closing(object sender, System.ComponentModel.CancelEventArgs e)
        {
            this.timerConnection.Stop();
            this.timerMain.Stop();
            FSUIPCConnection.Close();
        }
 // With this Button I am trying to write values to the Center Main Tank
        private void btnWrite_Click(object sender, RoutedEventArgs e)
        {
            FsFuelTank tank = this.fuelTanks[tankControl.FuelTank];
            FSFuelTanks.Centre_Main = txtboxCenterTank.Text;    //here the error occures
            FSUIPCConnection.PayloadServices.WriteChanges();
        }
    }
}