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    <p>Here is what I came up with, which is basically your option #2. In the <code>ItemTemplate</code> of the repeater, I use a Literal control (Visible set to false) which has the argument you wish to pass to the <code>CheckedChanged</code> function. The reason for using a control is because the control will retain its value in the ViewState after a post back, whereas the original data source for the Repeater will be lost.</p> <p>In the <code>OnItemCreated</code> function, I bind the <code>CheckChanged</code> function for all of the check boxes to pass in the right argument. Here's my complete example. In this case, I want to pass the <code>Id</code> property of my data to the <code>CheckChanged</code> function.</p> <p>Markup:</p> <pre><code>&lt;asp:Repeater ID="Repeater1" runat="server" OnItemCreated="ItemCreated"&gt; &lt;ItemTemplate&gt; &lt;asp:Literal ID="litArg" runat="server" Visible="false" Text='&lt;%# Eval("Id") %&gt;'&gt; &lt;/asp:Literal&gt;&lt;%# Eval("Name") %&gt; &lt;asp:CheckBox ID="chkCool" runat="server" AutoPostBack="true" Checked='&lt;%# Eval("IsCool") %&gt;' /&gt;&lt;br /&gt; &lt;/ItemTemplate&gt; &lt;/asp:Repeater&gt; </code></pre> <p>Code behind:</p> <pre><code>public class SomeClass { public SomeClass(bool c, string n, int id) { IsCool = c; Name = n; Id = id; } public bool IsCool { get; set; } public string Name { get; set; } public int Id { get; set; } } . . . protected void Page_Load(object sender, EventArgs e) { if (!IsPostBack) { List&lt;SomeClass&gt; people = new List&lt;SomeClass&gt;(); people.Add(new SomeClass(true, "Will", 666)); people.Add(new SomeClass(true, "Dan", 2)); people.Add(new SomeClass(true, "Lea", 4)); people.Add(new SomeClass(false, "Someone", 123)); Repeater1.DataSource = people; Repeater1.DataBind(); } } private void CheckChanged(int id) { Response.Write("CheckChanged called for item #" + id.ToString()); } protected void ItemCreated(object sender, RepeaterItemEventArgs e) { //this needs to be set again on post back CheckBox chk = (CheckBox)e.Item.FindControl("chkCool"); Literal arg = (Literal)e.Item.FindControl("litArg"); Action&lt;object, EventArgs&gt; handler = (s, args) =&gt; CheckChanged(Convert.ToInt32(arg.Text)); chk.CheckedChanged += new EventHandler(handler); } </code></pre> <p>Hope that helps.</p>
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    1. COThank you, Thank you. One thousand times thank you. I have been trying to solve this for 2 days. You really put in a bit of effort for this answer I wish i could up vote more than once. ;)
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    2. CONo problem :). I gotta say, sometimes the asp.net controls are just not easy to work with.
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