Question Textbox is not displaying value

[crystaluz]

Hello there... I use these codes to print out the location of the device. The problem is, the value is not appearing in the textbox (txtLatitude) when the form is loaded. But when I replace the textbox with MsgBox(Latitude) it works perfectly. I just don't understand why the value is not appearing in the textbox. Any suggestion? Thank you...

Imports System.Device.Location
Public Class Form1

    Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load

        Dim myLocation As New Form1()
        myLocation.GetLocationDataEvent()


    End Sub

    Private WithEvents watcher As GeoCoordinateWatcher
    Public Sub GetLocationDataEvent()
        watcher = New System.Device.Location.GeoCoordinateWatcher()
        AddHandler watcher.PositionChanged, AddressOf watcher_PositionChanged
        watcher.Start()

    End Sub

    Private Sub watcher_PositionChanged(ByVal sender As Object, ByVal e As GeoPositionChangedEventArgs(Of GeoCoordinate))
        PrintPosition(e.Position.Location.Latitude, e.Position.Location.Longitude)
        ' Stop receiving updates after the first one.
        watcher.Stop()
    End Sub

    Private Sub PrintPosition(ByVal Latitude As Double, ByVal Longitude As Double)

               txtLatitude.text = Latitude

    End Sub

End Class

 

[jmcilhinney]

The value IS appearing in the TextBox. It's just that the form containing the TextBox is not the form you're looking at. Here is your issue:

Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
    Dim myLocation As New Form1()
    myLocation.GetLocationDataEvent()
End Sub

When your Form1 form loads, it immediately creates a new Form1 and tells it to get and display the location data. That new Form1 form never gets displayed so you never see the data.

Think about it. Why would a Form1 object that just got loaded create a new Form1 object? How many Form1 objects do you want? If you only want one then why is the first one creating a second one?

 

[crystaluz]

When your Form1 form loads, it immediately creates a new Form1 and tells it to get and display the location data. That new Form1 form never gets displayed so you never see the data.

How did I not notice this.. Thank you!