Geocoordinatewarcher location is giving unknown value for longitude

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I have a C# form application in which timer is set for every 1 second.

Within that I want to check the location of my device. Code is as follows:
This is how timer is called

this.Time1SecTimer = new System.Windows.Forms.Timer(this.components);
this.Time1SecTimer.Interval = 1000;
this.Time1SecTimer.Tick += new System.EventHandler(this.Time1SecTimer_Tick);
Time1SecTimer.Enabled = true;

//Time1SecTimer_Tick method

private void Time1SecTimer_Tick(object sender, EventArgs e) //Time1SecTimer Tick Event (every 1 sec)
       {
           double longitude = GetLongLatValue();
           this.LongitudeValueLabel.Text = longitude.ToString();
       }

//GetLongLatValue method

public double GetLongLatValue()
        {
            GeoCoordinateWatcher watcher = new GeoCoordinateWatcher();

            GeoCoordinate coord = watcher.Position.Location;
            return coord.Longitude;

        }

Can anything be changed here for correct Longitude value?

What I have tried:

I have tried changing the GetLongLatValue method as follows but didn't work

GeoCoordinateWatcher watcher = new GeoCoordinateWatcher();
            watcher.TryStart(false, // Do not suppress permissions prompt.
            TimeSpan.FromMilliseconds(1000)); // Wait 1000 ms to start.

            GeoCoordinate coord = watcher.Position.Location;

Posted 17-Jun-19 7:24am

Member 13459382

Updated 17-Jun-19 8:21am

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Dave Kreskowiak · Accepted Answer · 2019-06-17T08:21:00

You're creating a new GeoCoordinateWatcher on every timer tick. DO NOT DO THAT!

You only one instance. So, create a class-level variable to hold the GeoCoordinateWatcher and use that to get the coordinate on every timer tick:

C#

public partial class Form1 : Form
{
    GeoCoordinateWatcher geo = null;

    public Form1()
    {
        InitializeComponent();
    }

    private void StartButton_Click(object sender, EventArgs e)
    {
        geo = new GeoCoordinateWatcher();

        geo.TryStart(false, TimeSpan.FromSeconds(3));

        if (geo.Status == GeoPositionStatus.Ready)
        {
            timer1.Interval = 1000;
            timer1.Start();
        }
    }

    private void Timer1_Tick(object sender, EventArgs e)
    {
        GeoCoordinate coord = geo.Position.Location;

        Log(coord.ToString());
    }

    private void Log(string message)
    {
        LogListBox.Items.Add(message);
    }
}

When your form closes, remember to call Dispose() on the watcher. I did not show that in the example.