ASP.net Vb.Net Label.Text not updating - asp.net

Question

In my VB.net ASP application, i have some ASPTREEVIEW where, on page load there is a Label, to which i set some value. After clicking on any row, i catch that value & assign it to the label.
But suddenly that label value is not updating by the chosen value. As if i check it via debugging the value, the value changes, but when i use Lable.text = chosen_value... It sets the value, but it is not actually changing on the html page. HTML shows the old value.
What will be the problem, i am not getting it.
Imports DevExpress
Imports DevExpress.Xpo
Imports DevExpress.Data
Imports DevExpress.Data.Filtering
Imports System.Data
Partial Class _Default
Inherits System.Web.UI.Page
Public testvar As Integer = 35
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
Dim xpcol As New XPCollection(Of WCSOEE.WcsGCObject)
Dim GCObj1 As WCSOEE.WcsGCObject
Dim Filter1 As New DevExpress.XtraCharts.DataFilter
Dim SelectedGCObject As WCSOEE.WcsGCObject
Filter1.ColumnName = "Oid"
Filter1.Condition = XtraCharts.DataFilterCondition.Equal
Filter1.Value = Label2.Text
If Label2.Text = "" Then
Label2.Text = 10
End If
For Each Siris As DevExpress.XtraCharts.Series In WebChartControl1.Series
' WebChartControl1.Series(Siris.Name).DataFilters.Item(0).Value = CInt(Label2.Text)
Next
Dim masterKeyvalue As DevExpress.Web.ASPxTreeList.TreeListNode = ASPxTreeList1.FocusedNode
If masterKeyvalue IsNot Nothing Then
SelectedGCObject = masterKeyvalue.DataItem
Else
SelectedGCObject = xpcol.Object(31)
End If
' MsgBox(SelectedGCObject.GCName)
MsgBox(Label2.Text)
If IsPostBack = False Then
Label2.Text = calculatehours(SelectedGCObject.Oid)
End If
End Sub
Protected Function calculatehours(Oid As Integer)
xpocolLogAvailability.Session = DevExpress.Xpo.XpoDefault.Session
Dim logavail As New XPCollection(Of WCSOEE.LogAvailability)
Dim gcobjlist As New XPCollection(Of WCSOEE.WcsGCObject)
gcobjlist.Filter = CriteriaOperator.Parse("[Oid]=?", Oid)
Dim filter As CriteriaOperator
Dim ds As New DataTable
Dim Series As New DevExpress.XtraCharts.Series
Dim Filter1 As New DevExpress.XtraCharts.DataFilter
' Label2.Text = Oid
logavail.Filter = CriteriaOperator.Parse("GCObject.Oid=?", Oid)
Filter1.ColumnName = "Oid"
Filter1.Condition = XtraCharts.DataFilterCondition.Equal
Filter1.Value = Oid
Dim arr1(32) As Long
'For i As Int16 = 1 To 32
' arr1(i) = 0
'Next
'For Each gcobj As WCSOEE.LogAvailability In logavail
' arr1(gcobj.Status) = arr1(gcobj.Status) + gcobj.Duration
'Next= ""
'ds.Columns.Add(New DataColumn("Name", System.Type.GetType("System.Int32")))
For Each Siris As DevExpress.XtraCharts.Series In WebChartControl1.Series
WebChartControl1.Series(Siris.Name).DataFilters.Item(0).Value = Oid
Next
WebChartControl1.RefreshData()
'For i As Int16 = 1 To 32
' ds.Rows.Add(i, arr1(i))
'Next
'ASPxListBox1.DataSource = ds
'ASPxListBox1.DataBind()
Return Oid
End Function
Protected Sub ASPxTreeList1_CustomCallback(sender As Object, e As DevExpress.Web.ASPxTreeList.TreeListCustomCallbackEventArgs) Handles ASPxTreeList1.CustomCallback
End Sub
Protected Sub ASPxTreeList1_FocusedNodeChanged(sender As Object, e As System.EventArgs) Handles ASPxTreeList1.FocusedNodeChanged
Dim masterKeyvalue As DevExpress.Web.ASPxTreeList.TreeListNode = ASPxTreeList1.FocusedNode
Dim SelectedGCObject As WCSOEE.WcsGCObject = masterKeyvalue.DataItem
' MsgBox(SelectedGCObject.GCName)
If IsPostBack Then
Label2.Text = calculatehours(SelectedGCObject.Oid)
End If
MsgBox(IsPostBack)
MsgBox(Label2.Text)
End Sub
End Class

Answer 1

Post some code so we can see exactly what your doing, without seeing anything so far ensure you have an If statement in your page load to only apply the label text if the current request is not a postback other wise the the label will be set to this on every request.
If Not IsPostBack() Then
lblSomeLabel.Text = "Page load text"
End If