how to get array element as output in vb asp.net2010 - asp.net

Question

In this program I created one array, while clicking on the get Button it does not show any output because the str variable is empty. How should I get proper output...
Partial Class dynamic_array
Inherits System.Web.UI.Page
Dim s(2) As String
Dim str As String
Protected Sub btn_save_Click(sender As Object, e As System.EventArgs) Handles btn_save.Click
Dim i As Integer = 0
For i = 0 To s.Length - 1
s(i) = InputBox("enter name " + (i + 1).ToString)
Next
End Sub
Protected Sub btn_get_Click(sender As Object, e As System.EventArgs) Handles btn_get.Click
Dim i As Integer = 0
str = ""
For i = 0 To s.Length - 1
str &= s(i) + vbCrLf
Next
MsgBox(str)
End Sub
End Class

Answer 1

You can use Session or ViewState to store the Array values..
try like this
Partial Class dynamic_array
Inherits System.Web.UI.Page
Dim s(2) As String
Dim str As String
Protected Sub btn_save_Click(sender As Object, e As System.EventArgs) Handles btn_save.Click
Dim i As Integer = 0
For i = 0 To s.Length - 1
s(i) = InputBox("enter name " + (i + 1).ToString)
Next
ViewState("Array")=s
End Sub
Protected Sub btn_get_Click(sender As Object, e As System.EventArgs) Handles btn_get.Click
Dim i As Integer = 0
str = ""
s= ViewState("Array")
For i = 0 To s.Length - 1
str &= s(i) + vbCrLf
Next
MsgBox(str)
End Sub
End Class
Hope this will help, Mark useful if it's helps.

Answer 2

In Asp.Net all variables set on the page level are reset on every postback. Thats why s-variable is always empty on get-button click.
You could save this information for example in the viewstate
Viewstate("MyData") = "Something"
I encourage you to familiarize your self with Asp.Net web forms basic state management: http://msdn.microsoft.com/en-us/library/50x35554(v=vs.80).aspx