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Set value for HTML control attribute marked as run at server

Asp.Net Web Forms stops rendering value of <%#: Item %> for HTML control attribute once control is marked as run at server. Herewith snippet of Repeater ItemTemplate:
<a id="RepeaterElement" runat="server" href="?code=<%#: Item %>"><%#: Item %></a>
The resulting HTML code instead of href="?code=MyValue" becomes literally what it is behind the scenes href="?code=<%#: Item %>".
How can I manipulate with attributes of HTML control marked as run at server from .aspx file within Repeater Item?

You are close, but you need the ?code= in the databinding expression.
<asp:Repeater ID="Repeater1" runat="server" ItemType="System.String">
<ItemTemplate>
<a id="RepeaterElement" runat="server" href='<%# "?code=" + Item %>'><%# Item %></a>
</ItemTemplate>
</asp:Repeater>

unable to bind data to label inside repeater

My code is like this
<asp:Repeater ID="rptEvaluationInfo" runat="server">
<ItemTemplate>
<asp:Label runat="server" Id="lblCampCode" Text="<%#Eval("CampCode") %>"></asp:Label>
</ItemTemplate>
Everything looks okay to me, But it generates an error in the runtime. When I remove this part
Text="<%#Eval("CampCode") %>"
error goes.
SO I assume the issue is with databind. So I tried an alternative like this
<asp:Repeater ID="Repeater1" runat="server">
<ItemTemplate>
<label><%#Eval("CampCode") %> </label>
</ItemTemplate>
And it also works good. Can any one tell me what is the issue with my first code?
Note: I don't have access to the error message due to the special
reasons on my project , that's why I have not posted it here.
And I want to use ASP controls itself on the case that's why i haven't
gone with my second solution

The problem is with quotes. Currently you have double quotes everywhere, so ASP.NET is not able to parse this. Change outer ones to single quotes like this:
Text='<%#Eval("CampCode") %>'

Accessing child control in ASP.NET

I am trying to find out if it's possible to have a control inside another control in ASP, like this:
<asp:FormView ID="FormView1" runat="server" Width="630px" Height="496px">
<ItemTemplate>
<asp:Literal ID="ID" runat="server">Idnumber: </asp:Literal><%#Eval("ID") %>
<asp:DataList ID="DataList1" runat="server">
<ItemTemplate>
<asp:HyperLink ID="ID" runat="server"> <%# Eval("FILE") %> </asp:HyperLink>
</ItemTemplate>
</asp:DataList>
</ItemTemplate>
</asp:FormView>
Can I access DataList1 control? I have been trying, but I can't figure it out, I should be able to access nested controls, but I cant get it to do it.

Controls inside Template tags cannot be directly accessed in code behind. Instead you should use FindControl method:
var dataList1 = (DataList)FormView1.FindControl("DataList1");
Note that this might not work in early stages of page life cycle (not until Page_Load I believe).

ASP.net - LinkButtons in a Repeater within an UpdatePanel are not triggering a postback of any kind

My page contains a Repeater that is loaded with data asynchronously as the data becomes available, using an UpdatePanel to manage the asynchronous requests.
The page contains something a little like this:
<asp:UpdatePanel ID="DataUpdatePanel" runat="server">
<ContentTemplate>
<table>
<asp:Repeater ID="RepeaterBlock" runat="server">
<HeaderTemplate><thead><tr><th>Name</th><th>Status</th><th class="empty"></th></tr></thead></HeaderTemplate>
<ItemTemplate><tr>
<td><a class="link" href="Detail.aspx?item=<%# DataBinder.Eval( Container.DataItem, "Name") %>"><%# DataBinder.Eval( Container.DataItem, "Name") %></a>
</td>
<td><%# DataBinder.Eval( Container.DataItem, "Status") %></td>
<td class="no-border">
[<asp:LinkButton CommandName='Schedule' CommandArgument='<%# DataBinder.Eval(Container.DataItem, "Name") %>' ID="ScheduleButton" runat="server" CausesValidation="false" >Schedule</asp:LinkButton>]
</td>
</tr></ItemTemplate>
</asp:Repeater>
</table>
</ContentTemplate>
</asp:UpdatePanel>
The problem being that the LinkButton does not appear to trigger a postback of any kind- there is no visible response to clicking on it and putting a break point on the event listener in the codebehind, it is never triggered.
I have tried manually adding a Trigger like this:
<Triggers>
<asp:AsyncPostBackTrigger ControlID="ScheduleButton" />
</Triggers>
But unfortunately becausee the controls are within the ContentTemplate it crashes out if I try to do that.
Another avenue I have explored is to explicitly add them in the codebehind:
RepeatData.DataBind();
RepeatData.ItemCommand += new RepeaterCommandEventHandler(RepeatData_ItemCommand);
UpdateScripts.RegisterAsyncPostBackControl(FindControlRecursive( RepeatData, "SchedulButton"));
The FindControlRecursive method just behaves like FindControl only it actually finds controls.
That doesn't crash out, but it also doesn't cause the LinkButtons to become effective.
Can anyone suggest what I need to do to cause them to post back as I expect them to?
Edit: Originally I had this page working without the UpdatePanel and it worked fine, with more data it started timing out, so I needed to obtain the data asynchronously. It was when I made this change that the linkbuttons ceased working.

You need to register all your link buttons to OnCommand with a server side event handler to use the CommandName / CommandArg properties.
[<asp:LinkButton CommandName='Schedule' CommandArgument='<%# DataBinder.Eval(Container.DataItem, "Name") %>' ID="ScheduleButton" runat="server" CausesValidation="false" OnCommand="LinkButtonCommandEventHandler" >Schedule</asp:LinkButton>]
See msdn reference:
http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.linkbutton.commandname.aspx

You need either <asp:Repeater ID="RepeaterBlock" runat="server" OnItemCommand="RepeaterData_ItemCommand">
or RepeatData.ItemCommand += new RepeaterCommandEventHandler(RepeatData_ItemCommand); in each postback before RepeatData.DataBind();

How to bind a classes property to a TextBox?

I have a Customer class with a string property comments and I am trying to bind it like this:
<asp:TextBox ID="txtComments"
runat="server"
TextMode="MultiLine" Text=<%=customer.Comments %>>
</asp:TextBox>
However, it gives me the error:
Server tags cannot contain <% ... %> constructs.
I also have a method in the class called GetCreatedDate and in the aspx page, I am doing
<%=GetCreatedDate()%> and <%GetCreatedDate();%>. What is the difference?

Alternatively you can set the value in the Page_Load event of the code behind file:
txtComments.Text = customer.Comments;

you should use "<%# %>" for data binding
<asp:TextBox ID="txtComments"
runat="server"
TextMode="MultiLine" Text="<%# customer.Comments %>">
</asp:TextBox>

Try this instead.
<asp:TextBox ID="txtComments"
runat="server"
TextMode="MultiLine" Text=<%# customer.Comments %>>
</asp:TextBox>
Notice the = to #

Use the DataBinding syntax as stated, <%# customer.Comments %>. This syntax is only evaluated when the TextBox is databound. You would usually use it in a DataBound list. In this case you need to databind the control manually. Override the page's OnDataBinding method and call txtComments.DataBind();
The databinding syntax is the only way to declaratively set ServerControl properties from the aspx page. The Response.Write of the other syntax happens at a time that the ServerControl properties cannot be accessed. If the control is not inside a databound control, you have to databind it.
If you were looking to go all declarative in your page, you don't gain to much using this method because you still need to write code in the code behind.
An alternative if you want to use the TextBox on its own without a parent DataBound control would be to subclass the TextBox, add an AutoBind property, and in the subclassed control call its DataBind method if it is true. That would let you bind the values without writing databinding code in the code behind.
You could also add the TextBox and other form controls to a FormView control and bind it to your object. You can still use the DataBinding syntax in that case.

try this
<asp:TextBox ID="txtComments"
runat="server"
TextMode="MultiLine" Text='<%# customer.Comments %>'>
</asp:TextBox>