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Variable Not Recognized When Data Binding Attempted

Here is a snippet of my code:
<%for (int i = 1; i <= MessageList.Count; i++)
{
switch (LevelList[i-1])
{
case 0:%>
<div class="well offset1" style="width:80%">
<h1><%= MessageList[i - 1].Header%></h1>
<p><%= MessageList[i - 1].Body%></p>
<ul>
<li style="display:inline">Likes: <%= MessageList[i - 1].NumberOfLikes%></li>
<li style="display:inline">Replies: <%= MessageList[i - 1].NumberOfReplies%></li>
</ul>
<ul>
<li style="display:inline"><asp:Button ID="LikeButton" messID="<%# MessageList[i-1].MessageID %>" runat="server" Text="Like" /></li>
<li style="display:inline"><asp:Button ID="ReplyButton" messID="<%# MessageList[i-1].MessageID %>" runat="server" Text="Reply" /></li>
</ul>
</div>
<%break;
My problem is with the "messID" in this part:
<li style="display:inline"><asp:Button ID="LikeButton" messID="<%# MessageList[i-1].MessageID %>" runat="server" Text="Like" /></li>
At first I was attempting to pass a variable to the codebehind using messID="<%= calculated value%>" and using Button.Attribute["messID"] to access this variable, however, instead of passing the calculated variable as a string this passed a string that looked <%= calculated variable%>. After some research I found out that the <% could not be used with asp controls. So now I am attempting to use the <%# tag and DataBind(), however, now whatever is inside the <%# tags is not recognizing the variable i which is part of the forloop. Why does this happen?

Why not you just use html a tag?
All I want to do is to procedural generate buttons on my page, each of which will correspond to a message. When a user clicks on one of the reply buttons, it takes them to a page where they can write their response.
change
<li style="display:inline"><asp:Button ID="LikeButton" messID="<%# MessageList[i-1].MessageID %>" runat="server" Text="Like" /></li>
to
<li style="display:inline">Like</li>

Masterpage controllist only returns some controls

I have a little problem with my ASP.Net Page.
I'm trying to get all controls from my masterpage within the masterpage code.
I did this with the Child page using this code
foreach (Control ctrl in ContentPlaceHolder1.Controls)
{
if (ctrl.GetType() == typeof(Label))
{
//Do Stuff...
}
}
but when i try to get the other controls with
foreach (Control ctrl in this.form1.Controls)
it doesn't work completly.
I get 3 of my Labels but can't access the rest.
Here is a part of my ASP Code
<div style="float: right;">
<ul class="main-language language-level main-language-level-0" >
<li><a href="">
<asp:Label runat="server" Text="Deutschland" ID="lbl_Language"/>
</a>
<ul class="language-level main-language-level-1">
<li>
<a href="?Lng=EN">
<asp:Label ID="lbl_English" runat="server" Text="United Kingdom" ForeColor="#0D679C" Font-Names="Century Gothic" />
</a>
<span>English</span>
</li>
<li>
<a href="?Lng=DE">
<asp:Label ID="lbl_German" runat="server" Text="Deutschland" ForeColor="#0D679C" Font-Names="Century Gothic" />
</a>
<span>Deutsch</span>
</li>
</ul>
<img class="menu-image" src="Images/arrow_languageselection.png" />
</li>
</ul>
<br />
<a href="CustomerServiceLogin.aspx?Lgn=22TR" runat="server" id="LogLink">
<asp:Label CssClass="ButtonOrange" runat="server" ID="lbl_Login" />
<asp:Label CssClass="ButtonOrange" runat="server" ID="lbl_Logoff" Visible="false" />
</a>
</div>
The only labels i can find are lbl_Language,lbl_English and lbl_German
Has somebody a solution for this?
Sincerely
CarnVanBeck

If the labels that you cannot access are nested inside another control then they will not be returned when you iterate over form1.controls. You will need a recursive solution to return all of your controls.
foreach (Control ctrl in this.form1.Controls)
{
if (ctrl.Controls.Count > 0)
{
// do recursive call
}
}

How to show the diff panel when li click

I want to show the different panel when i click the HTML list item. Am using the menu with list item list item having four list and am also having four panel. i want to show the panel when click the li menu..
My partial code is here..
<ul id="menulist1">
<li>General Info</li> // show pan_genral
<li>Contact Info</li> // show pan_contact
<li>Job Info</li> // show pan_job
<li>Qualification</li>// show pan_Quali
</ul>
<asp:Panel ID="pan_contact" runat="server" Height="388px" Visible="false">
<table border="0" cellpadding="2px" cellspacing="4px" width="100%">
<tr>
<td>contact</td>
</tr>
</table>
</asp:Panel>
please help me to do this...

Write the onclick function for the li and send the id of the panel to show, as this code:
<ul id="menulist1">
<li>General Info</li>
<li>ContactInfo</li>
<li>Job Info</li>
<li>Qualification</li>
</ul>
<script>
function showPanel(panId)
{
var panel=document.getElementById(panId)
panel.style.display="";
}
</script>
for the panel, don't use visible=false but use: style="display:none"
<asp:Panel ID="pan_contact" runat="server" Height="388px" style="display:none">
<table border="0" cellpadding="2px" cellspacing="4px" width="100%">
<tr>
<td>contact</td>
</tr>
</table>
</asp:Panel>

You can achieve this with a bit of javascript, but note that if you are using a master page, the ContentPlaceholderID gets prepended to the panel ID. For instance, if your ContentPlaceholderID is MainContent, you will need something like this:
function showPanel(panelId) {
var panel = document.getElementById("MainContent_" + panelId);
panel.style.display = 'block';
}
But, like previous answer states, use style="display:none" instead of Visible=false in your panel for this to work.
If you want the bullets to also trigger the panel, move onclick to your li tag.
<li onclick="showPanel('pan_contact')">Contact Info</li>

How can i make a div as non selectable from code behind

I have my div as follows
<div class="menu" id="admindiv" runat="server">
<ul>
<li>welcome to my site<!--[if IE 7]><!--><!--<![endif]-->
<table>
<tr>
<td>
<ul>
<li>Reports</li>
<li>Delete</li>
</ul>
</td>
</tr>
</table>
<!--[if lte IE 6]></a><![endif]-->
</li>
<!--[if lte IE 6]></a><![endif]-->
</ul>
</div>
I would like to enable or disable on a page from code behind, means i would like to make this div as non selectable field on certain conditions. I tried this but i didn't get succeeded
protected void Page_Load(object sender, EventArgs e)
{
admindiv.Attributes.Add("style", "color:gray;");
admindiv.Attributes.Add("disabled", "true");
}

You can't make a DIV non-selectable. If you want to make the links non-clickable, this is the code-snipt does it:
<div class="menu" id="admindiv">
<ul>
<li>welcome to my site<!--[if IE 7]><!--><!--<![endif]-->
<table>
<tr>
<td>
<ul>
<li>
<asp:HyperLink ID="Link1" runat="server" Text="Reports" />
</li>
<li>
<asp:HyperLink ID="Link2" runat="server" Text="Delete" />
</li>
</ul>
</td>
</tr>
</table>
<!--[if lte IE 6]></a><![endif]-->
</li>
<!--[if lte IE 6]></a><![endif]-->
</ul>
</div>
AND the code-behind:
protected void Page_Load(object sender, EventArgs e) {
if(isAdmin) { // check for admin user
Link1.NavigateUrl = "Reports.aspx";
Link1.NavigateUr2 = "Delete.aspx";
} else {
Link1.NavigateUrl = "javascript:return void;";
Link1.NavigateUr2 = "javascript:return void;";
}
}

Divs can be shown and hidden, but not disabled. If the div is visible its contents will be active unless you disable each item individually.
Another option to disabling each control is to create a new div that is transparent but sits on top of the part you want to disable, then just show / hide that div from the code behind.
However this is not a security mechanism, as anyone with a browser HTML developer plug-in (like firebug) can remove that div and gain access to the controls.
The best way to disable links in ASP.NET is to add an "onclick" event (works with linkbuttons and hyperlinks):
LinkButton1.Attributes["OnClick"] = “return false;”;

populate a html list control using .NET

I have a list defined like so:
<ul id="myList" class='myClass'>
<li class="myItemClass">Item 1</li>
<li class="myItemClass">Item 2</li>
</ul>
using .NET how can I add items to the list dynamically? I also need to specify the class name on each new item

you can even use that HTML, adding runat="server" you will be able to treat it as a HTMLControl no mater what control it is, I do this often with div's
<ul id="myList" runat="server" class="myClass">
<li class="myItemClass">Item 1</li>
<li class="myItemClass">Item 2</li>
</ul>
then you get that HTMLControl and play with it
HtmlGenericControl li;
for (int x = 3; x <= 10; x++)
{
li = new HtmlGenericControl("li");
li.Attributes.Add("class", "myItemClass");
li.InnerText = "Item " + x;
myList.Controls.Add(li);
}
you will end up with:
<ul id="myList" runat="server" class="myClass">
<li class="myItemClass">Item 1</li>
<li class="myItemClass">Item 2</li>
<li class="myItemClass">Item 3</li>
<li class="myItemClass">Item 4</li>
<li class="myItemClass">Item 5</li>
<li class="myItemClass">Item 6</li>
<li class="myItemClass">Item 7</li>
<li class="myItemClass">Item 8</li>
<li class="myItemClass">Item 9</li>
<li class="myItemClass">Item 10</li>
</ul>
of course that you can use an ordered or unorderer list, they also below to the ASP.NET Web Controls.
<asp:BulletedList runat="server" ...

You could use asp:BulletedList like
<asp:BulletedList ID="MyList1" CssClass="MyClass" runat="server">
<asp:ListItem Text="Item1" class="MyClass" />
</asp:BulletedList>
Add add code like
ListItem item = new ListItem("Item2");
item.Attributes.Add("class", "MyClass");
MyList1.Items.Add(item);
Or if for some specific reason you need to use the ul tag then you can add a runat="server" to it. E.g.
<ul id="MyList2" class="MyClass" runat="server">
<li class="MyClass">Item1</li>
</ul>
With code like
HtmlGenericControl li = new HtmlGenericControl("li");
li.Attributes.Add("class", "MyClass");
li.InnerText = "Item2";
MyList2.Controls.Add(li);

The simplest way you can solve this problem is by using the asp repeater control
<ul id="myList" class='myClass'>
<asp:Repeater ID="repeaterMyList" Runat="server">
<ItemTemplate>
<li class="myItemClass">
<%# Eval("Item") %>
</li>
</ItemTemplate>
</asp:Repeater>
</ul>
[Edit] - Do remember to set the datasource on repeaterMyList and call databind on the repeater control in the codebehind.
repeaterMyList.DataSource = someDataTable;
repeaterMyList.DataBind();

I'm assuming that there is a valid reason for you not to use the BulletedList webserver control. Anyway, this is an interesting programming exercise that illustrates the internals of the Htmlservercontrol architecture and how they map to simple HTML tags.
The HTML ul and li tags are not directly mapped as HTMLServercontrols. This means that even if you add a runat="server" attribute to the list, it's contents will not be directly accessible as listitems.
However, all controls not directly mapped as Html server controls are accessible via the HtmlGenericControl class. This makes it possible to create and modify such controls dynamically.
The solution, therefore, is twofold:
Make the unordered list runat="server" so that you can access it in server-side code. Also, you should make the existing items in the list runat="server", else they will be only be accessible as an LiteralControl that contains the first two listitems as plain text.
In code, access the contents of the list and add a new HtmlGenericControl of type "li" to it.
The following (bare-bones simple) page demonstrates this procedure :
<%# Page Language="VB" AutoEventWireup="false" %>
<%# Import Namespace="System.Collections.Generic" %>
<script runat="server">
Private Shared addedItems As List(Of HtmlGenericControl)
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
If Not Page.IsPostBack Then
'On first load, instantiate the List.
addedItems = New List(Of HtmlGenericControl)
End If
End Sub
Protected Sub btn1_Click(ByVal sender As Object, ByVal e As System.EventArgs)
'Add the previously created items to the UL list.
'This step is necessary because
'...the previously added items are lost on postback.
For i As Integer = 0 To addedItems.Count - 1
myList.Controls.Add(addedItems.Item(i))
Next
'Get the existing no. of items in the list
Dim count As Integer = myList.Controls.Count
'Create a new list item based on input in textbox.
Dim li As HtmlGenericControl = CreateBulletItem()
'Add the new list item at the end of the BulletedList.
myList.Controls.AddAt(count, li)
'Also add this newly created list item to the generic list.
addedItems.Add(li)
End Sub
Private Function CreateBulletItem() As HtmlGenericControl
Dim li As New HtmlGenericControl("li")
li.InnerText = txtNewItem.Value
li.Attributes("class") = "myItemClass"
Return li
End Function
</script>
<html>
<head runat="server">
<title>Test Page</title>
</head>
<body>
<form id="form1" runat="server">
<div>
<ul id="myList" class='myClass' runat="server">
<li runat="server" class="myItemClass">Item 1</li>
<li runat="server" class="myItemClass">Item 2</li>
</ul>
<input type="text" id="txtNewItem" runat="server" />
<asp:Button ID="btn1" runat="server" Text="Add" OnClick="btn1_Click" />
</div>
</form>
</body>
</html>