using Session variables for arraylist in TEXTBOXES

[adarshyam]

hi.. I am new to vb.net i am doing a program using dynamic textboxes which involves two pages .. where values of textboxes in one page must be transfered to to other sex of textboxes in another page, . please help me .. I tried using session variables but its not working.. this s my code..

PAGE 1

 Protected Sub Button5_Click(ByVal sender As Object, ByVal e As EventArgs) Handles Button5.Click
 
nval2 = TextBox2.Text
 
            If numofper > nval2 Then
                Session("a1") = textdynamic5
                SessionHandler.keynval2 = nval2
                Response.Redirect("fortpage.aspx")
 
            Else
                MsgBox("'n' value must be less than Number of Periods")
            End If
 
 Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
 
If Session("weights") = True Then
            ReDim TxtDyn5(nval2)
            Button4.EnableViewState = True
            Button4.ID = "btn4"
            For m As Integer = 0 To nval2 - 1
                TxtDyn5(m) = New TextBox
                TxtDyn5(m).EnableViewState = True
                Panel4.Controls.Add(TxtDyn5(m))
                textdynamic5.Add(textdynamic5)
                TxtDyn5(m).Width = 60
 
            Next
            Session("a1") = True
        End If
 
 
    End Sub
 
 

PAGE 2

Dim textdynamic5 As New ArrayList
    Dim TxtDyn5 As TextBox()
 
 Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
 
Dim textdynamic5 As ArrayList = CType(HttpContext.Current.Session("a1"), ArrayList)
 
 ElseIf Session("WMA") = True Then
            Label4.Text = "WEIGHTED MOVING AVERAGE"
 
            Dim nval2 As String = SessionHandler.keynval2
            Label6.Text = "" + nval2
            Label7.Text = "Value of 'n'"
            Label8.Text = "Weights"
            If Session("weights") = True Then
 
                ReDim TxtDyn5(nval2)
                textdynamic5 = Session("a1")
                For m As Integer = 0 To nval2 - 1
                    TxtDyn5(m) = New TextBox
                    TxtDyn5(m).EnableViewState = True
                    Panel14.Controls.Add(TxtDyn5(m))
                    textdynamic5.Add(textdynamic5)
                    TxtDyn5(m).Width = 60
 
                Next
 
            End If
end sub
 

please temme wher im goin wrong..

[stoogots2]

adarshyam,

I didn't look at your code, but I will give you the first place to look when troubleshooting controls that were added dynamically.

When you add controls dynamically, remember that you have to recreate the controls on postback specifically in OnInit in order to have the ViewState for those controls loaded (ViewState should contain your textbox values that the user typed). So viewstate should be turned on for those controls, and the ID property for each control must be the same when you add it on Page_Load, and recreate/readd it on OnInit.

Hope that helps.

[adarshyam]

thank u v much for your reply.. i have one more doubt.. while recreating the controls in next page can i use same name to those controls? and should i keep the arraylist also in session and get back in next page? if so can u pls temme how..

[Frinavale]

thank u v much for your reply.. i have one more doubt.. while recreating the controls in next page can i use same name to those controls?

Sure!
This is probably advisable because it'll help you understand what is what.

What I don't understand is why you need to name the controls if they are in an arraylist??

and should i keep the arraylist also in session and get back in next page? if so can u pls temme how..

Check out the article on how to use dynamic controls in ASP.NET

-Frinny

[adarshyam]

ok i ve refined my question tis tym :)

i need to bring the values of textboxes from page1 to page2

page1

' i ve created textboxes using a button n put the textboxes in viewstate in pageload with same ID. i ve given the session of arraylist in the goto next page button

pageload

        If Session("weights") = True Then
    Dim textdynamicwt As New ArrayList()
    Dim TxtDynwt As TextBox()
            ReDim TxtDynwt(nval2)
            Button4.EnableViewState = True
            Button4.ID = "btn4"
            For m As Integer = 0 To nval2 - 1
                TxtDynwt(m) = New TextBox
                TxtDynwt(m).EnableViewState = True
                Panel4.Controls.Add(TxtDynwt(m))
                textdynamicwt.Add(textdynamicwt)
                TxtDynwt(m).Width = 60
                TxtDynwt(m).ID = "TxtDynwt_" & m
            Next
 
        End If
 

button(goto next page)

         If Session("weights") = True Then
         Session("txtdyn") = textdynamicwt
 

page 2

' i ve created dyn textboxes again and retrieved arraylist from session

pageload

 
   textdynamicwt = Session("txtdyn")
            If Session("weights") = True Then
   Dim textdynamicwt As New ArrayList
   Dim TxtDynwt As TextBox()
                ReDim TxtDynwt(nval2)
                For m As Integer = 0 To nval2 - 1
                    TxtDynwt(m) = New TextBox
                    TxtDynwt(m).EnableViewState = True
                    Panel14.Controls.Add(TxtDynwt(m))
                    textdynamicwt.Add(textdynamicwt)
                    TxtDynwt(m).Width = 60
                    TxtDynwt(m).ID = "TxtDynwt_" & m
                Next
            End If
 

Now my problem is i can see only empty textboxes in page2 i cant get the values that i entered in the textboxes in page1. please help me with a solution i am trying this for the past two days.. im very new to vb.net...

[Frinavale]

Did you read the article on how to use dynamic controls that I posted earlier?
You cannot add your TextBoxes to the page in the PageLoad event. You have to do that in the OnInit event....

Please read the article for why.
This will explain why you aren't getting any text values.

In the future please remember to use code tags when posting code snippets.

-Frinny

[adarshyam]

sorry i forgot to use code tags and thanks for the guidance..

[adarshyam]

frinny,
can you please send me the link for the article u were talkin about..i couldnt find it in the forum.. i see webform_Init event.. is that the same as OnInit??

[Curtis Rutland]

Here's Frinny's article:
http://bytes.com/forum/thread750415.html