Google Answers: ASP.Net Datalist

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Q: ASP.Net Datalist ( No Answer, 1 Comment )

Question

Subject: ASP.Net Datalist
Category: Computers > Programming
Asked by: gums-ga
List Price: $5.00

Posted: 05 Feb 2004 09:25 PST
Expires: 06 Mar 2004 09:25 PST
Question ID: 303794

I am using a datalist control in my page and it has a header template.
In the header template I have a table control with table rows and
table cells. While the page is loading I am trying to change the
contents of one of the cells. By using FindControl() I am getting
an error message that it cannot find an instance of an object.
I am giving the page code and code behind. 

I am trying to insert a literal control in the table cell with
id="celltwo", but not able to do so. Any one has any answers.

-----------------------
<%@ Page Language="vb"   AutoEventWireUp ="False"
Codebehind="WebForm2.aspx.vb" Inherits="ATMTransactions.WebForm2"%>



<html><head>
<title>PageControlsAdd</title>
</head>
<body>
<form id="f1" runat="server">
 <asp:Datalist id="list" runat="server">
 <headertemplate>
    <asp:Table id="t5" runat="server" GridLines="both"
BorderWidth="1px">
    <asp:TableRow>
        <asp:TableCell id="cellone">Cell 1</asp:TableCell>
        <asp:TableCell id="celltwo">Cell 2</asp:TableCell>
    </asp:TableRow>
    </asp:table>
    <asp:Button id="joincrowd" text="Join The Crowd" runat="server"/>
</headertemplate>
</asp:datalist>
</form>
</body>
</html>


-------------- Code behind---------------------
Public Class WebForm2
    Inherits System.Web.UI.Page
    Protected WithEvents t5 As System.Web.UI.WebControls.Table
#Region " Web Form Designer Generated Code "

    'This call is required by the Web Form Designer.
    <System.Diagnostics.DebuggerStepThrough()> Private Sub
InitializeComponent()

    End Sub

    Private Sub Page_Init(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles MyBase.Init
        'CODEGEN: This method call is required by the Web Form
Designer
        'Do not modify it using the code editor.
        InitializeComponent()
    End Sub

#End Region

    Private Sub Page_Load(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles MyBase.Load
        'Put user code to initialize the page here


        ' This example just injects some plain text
        Dim whatever As DataList
        whatever = CType(Page.FindControl("mydatalist"), DataList)

        Dim whatever1 As Control = whatever.FindControl("celltwo")
            whatever1.Controls.Add(New LiteralControl("hello"))        
        
        

    End Sub

End Class

Answer

There is no answer at this time.

Comments

Subject: Re: ASP.Net Datalist
From: amethyst-ga on 13 Feb 2004 01:57 PST

You have to Handle ItemCreated Event of the DataList and then use the
EventArgs argument to get the reference of the control.

eg. 

Private Sub DataList1_ItemCreated(Sender As  Object,e As DataListItemEventHandler )
If e.Item.ItemType =ListItemType.Header
Dim cell as TableCell = CType(e.Item.FindControl("t5"),Table).Cells(1)
End If
End Sub

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