Accessing Data From DataList In Page Load

Jul 29, 2011

New to VB.net, and trying to re-factor an 'old-skool' ASP page where all the page logic is happening on the .aspx page itself, to code-behind. Basically, I have a button that has a state, either on or off. If on, I set a hidden field to 1, if off, I set it to 0 (the default when a user visits the page).The goal is to simply change the message I am sending to the user.[code]The above code produces the following effect: when I click the button, setting the state to 1 and the page reloads, in Page_Load, I am getting zero results from the If dlList.Items.Count > 0 Then check, and thus am showing the 'No results' message, but the actual asp:DataList on the MyPage.aspx page is returning results... and then if I click the button again, setting it back to 0, in Page_Load, the datalist is now returning results, so I set the text to 'Results', but again, the control on the MyPage.aspx page behaves correctly, and shows no results, as expected. Now keep in mind that the above works perfectly in terms of checking the number of results if I move the If dlList.Items.Count > 0 Then page logic out of Page_Load and back to the MyPage.aspx file, it all works fine (i.e. results when state = 1, none when state = 0)

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I have an ASP.NET page (WebForm) on which I set the content of a central DIV by dynamically loading one of five user controls during Page_Load, dependant on the stage of the application.

One of the user controls contains radio buttons and a text box together with a submit button. What I want to do is process that information when the form is posted using the submit button.

I could do this with an AJAX call using jQuery, but I don't really want to do that, so I'm trying to access the form data on postback, but on page load following the postback the data is not present in the Request.Form object.

Looking at what I need to do it seems pretty simple and I'm sure is once you've got your head around it, but I can't find out how to carry this out. Some of the things I have read refer to event bubbling, but that doesn't make too much sense in this scenario.

EDIT: To clarify, I want to post the page back to itself to capture the values from the form elements via the Request object, store them in the database, and then display a confirmation message (or something else) on postback, and not re-display the same control again. So I won't be loading the same user control again.

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Dec 23, 2011

I'm trying to export the details in my datalist into a PDF file by using this third part program called Itextsharp. However, I'm encountering problems in generating the PDF as it keeps giving me the "Object reference not set to an instance of an object" error which points to my "htmlparser.Parse(sr)"

I been trying for 2 hours now to fix this problem however no progress. Does anyone here have experience in Itextsharp?

Here is the code that runs the export to PDF command

Protected Sub Button15_Click(ByVal sender As Object, ByVal e As System.EventArgs)

Response.ContentType = "application/pdf"
Response.AddHeader("content-disposition", "attachment;filename=Resume.pdf")

[CODE]...

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<asp:DataList ID="dlSection" runat="server" Width="100%">
<ItemTemplate>
<div>

[code].....

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[Code]....

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'Response.Cache.SetExpires(DateTime.UtcNow.AddDays(-1))
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'Response.Cache.SetRevalidation(HttpCacheRevalidation.AllCaches)
'Response.Cache.SetCacheability(HttpCacheability.NoCache)
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Public ReadOnly Property SelectedPage() As String
Get
Return _selectedPage
End Get
End Property

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Jan 5, 2011

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[Code]...

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Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs)
RD.Read()
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[code]....

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How can i list my data in that control?

just like: I had a table with data like id, name

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[Code]...

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[code]....

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[Code]...

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[Code]...

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[Code]...

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