WPF Textbox Binding. VB.Net 2017 - wpf

Question

Scenario:
A structure is associated with an indexed random access file.
Data is loaded from the file in the constructor at boot time , and the structure is automatically assigned the data values from the file, and the textboxes in the WPF window is automatically populated.
The structure is also updated if the user enter new values in a textbox. So far so good.
The problem arise when the user loads a different dataset from the file when the program is running. This happen in a Button Click event. The structure is updated, but this change is not reflected in the textboxes.
Can someone hopefully shed some light on this.
Pretty new to both WPF and VB.Net
Public Class MainWindow
Shared myStruct As aStruct
Public Structure aStruct
Implements INotifyPropertyChanged
Public Event PropertyChanged As PropertyChangedEventHandler Implements INotifyPropertyChanged.PropertyChanged
Public year As Integer
Public Property YearP As Integer
Get
Return myStruct.year
End Get
Set(value As Integer)
myStruct.year = value
End Set
End Property
Public salary as Integer
Public Property SalaryP As Integer
Get
Return myStruct.salary
End Get
Set(value As Integer)
myStruct.salary = value
End Set
End Property
.......
.......
End Structure
Public Sub New()
Me.New(".\indxfile.ptx", ".\datafile.dat")
' This call is required by the designer.
'InitializeComponent() ' Moved
' Add any initialization after the InitializeComponent() call.
End Sub
Public Sub New(Optional _IndexFileName As String = "", Optional _DataFileName As String = "")
' This call is required by the designer.
InitializeComponent()
' Add any initialization after the InitializeComponent() call.
Me.DataContext = myStruct
Dim Retval As Integer
Retval = GetRecord(2018, DataFileName, Len(myStruct), myStruct, IndexFilename)
If Retval <> 0 Then
MsgBox("Error")
End If
End Class
<TextBox x:Name="Year" Text = "{Binding YearP, Mode = TwoWay}"

Answer 1

Your 'Set' properties need to invoke the PropertyChanged event so that the data binding updates.