Event does not wire up in aspx page

Question

I have dynamically created Tree Node and child nodes in my asp.net web application.
I haved added SelectedNodeChanged event via properties on my child nodes. I run my application but the event did not fire. When i looked back
I could see that changed event has been added in aspx file.

aspx page with page directive Codebehind="Default.aspx.vb"

<table>
<tr>
<td>
<asp:Panel ID="pnlSample" Height="450px" width="550px" BorderStyle=Solid BorderColor=black BorderWidth=1px runat="server" ScrollBars=Vertical>
<asp:TreeView ID="SampleTreeView" runat="server"></asp:TreeView>
</asp:Panel>
</td>
</tr>
</table>

Code Behind:

Protected Sub SampleTreeView_SelectedNodeChanged(sender As Object, e As EventArgs) Handles SampleTreeView.SelectedNodeChanged

Dim filePath As String = SampleTreeView.SelectedValue

// Some code

End Sub

Answer 1

your this line:

 

<asp:TreeView ID="SampleTreeView" runat="server"></asp:TreeView>

 

needs to be changed to:

<asp:TreeView ID="SampleTreeView" runat="server" OnSelectedNodeChanged="SampleTreeView_SelectedNodeChanged"></asp:TreeView> 

Answer 2

This is my code in changed event. I did not post there for simplicity.

 

Protected Sub SampleTreeView_SelectedNodeChanged(sender As Object, e As EventArgs) Handles SampleTreeView.SelectedNodeChanged


Try
Dim filePath As String = SampleTreeView.SelectedValue

If File.Exists(filePath) Then
Response.ContentType = "application/pdf"
Response.AddHeader("Content-Disposition", [String].Format("attachment;filename=""{0}""", filePath))
Response.TransmitFile(filePath)
Response.Flush()
Else
HttpContext.Current.Response.StatusCode = 404
HttpContext.Current.Response.Flush()
End If

Catch ex As Exception
HttpContext.Current.Response.StatusCode = 404
HttpContext.Current.Response.Flush()
Throw
End Try

End Sub

 

<%@ Page Language="VB" AutoEventWireup="false" Inherits="SamleApp._Default" Codebehind="Default.aspx.vb" %> 

In aspx page directive it is declared as :

Answer 3

where is your code then?

 

you said in your question

 

Code Behind:

Protected Sub SampleTreeView_SelectedNodeChanged(sender As Object, e As EventArgs) Handles SampleTreeView.SelectedNodeChanged

Dim filePath As String = SampleTreeView.SelectedValue

// Some code

End Sub

 

what is that?