How to dynamically assign asp.net control ID's

I want to do somethin开发者_如何学编程g like the following in an asp.net web form but get a Invalid Token error message:

<ul>
    <%foreach (var item in Items) {%>
    <li>
      <asp:TextBox ID="<%= item.Id  %>" runat="server" />
    </li>
    <%} %>
</ul>

What alternative methods are there to achieve the desired result?

Server side controls (i.e. those with runat="server") have to have IDs set at compile time (because the ID is used to name the member field representing the control).

Either:

• Use some form of repeater control (i.e. create a collection of controls) and data binding to populate.
• create HTML (i.e. not server side controls) directly.

In ASP.NET the former is usual, with ASP.NET MVC the latter (via HTML Helpers) is usual.

Give a try to following approach:-

    foreach (Item item in items) 
    {
       TextBox txtBox=new TextBox();
       txtBox.ID=item.ID;
       placeHolder.Controls.Add(txtBox);
    }

Also make sure you dont have any invalid character like ("-"), it can create problem for you sometimes.