I have a LinkButton which fires an OnClick event to
update some Labels; however, after the first firing of OnClick, it won't
fire again when I click another (or the same) LinkButton which runs the
same OnClick event. (It's a list of people, each a LinkButton, and
clicking on one brings up their details)

If I leave the page a few minutes, it will work again, almost as if
whatever was preventing OnClick firing timed-out. Of course, this won't
be any use to the users!

This is my ASP.NET code for the LinkButtons (encapsulated in a DataList):

<asp:DataList ID="DataList1" runat="server" DataKeyField="AdmissionNumber">        <ItemTemplate>            <asp:CheckBox ID="CheckBox" runat="server" OnCheckedChanged="Checkbox_CheckedChanged" ViewState="true"/>            <asp:LinkButton ID="LinkButton" runat="server" OnClick="LinkButton_OnClick">                <asp:HiddenField ID="hfAdmissionNumber" Value='<%# Eval("AdmissionNumber") %>' runat="server"/>                <asp:Label ID="CalledLabel" runat="server" Text='<%# Eval("Called") %>' />                 <asp:Label ID="SurnameLabel" runat="server" Text='<%# Eval("Surname") %>' />            </asp:LinkButton><br /><br />        </ItemTemplate></asp:DataList>

In the Page_Load event in the C# code behind, the following populates the DataList:

connection.Open();SqlDataReader reader = command.ExecuteReader();DataList1.DataSource = reader;DataList1.DataBind();connection.Close()

And this is the OnClick event:

protected void LinkButton_OnClick(object sender, EventArgs e){    LinkButton l = (LinkButton)sender;    HiddenField hfv = (HiddenField)l.Parent.FindControl("hfAdmissionNumber");    using (SqlConnection connection = new SqlConnection("Data Source=pastonmis01inform;Initial Catalog=2009;Integrated Security=True"))    {        using (SqlCommand command = new SqlCommand("xProcSportNotParticipantDetails",connection))        {            connection.Open( );            command.CommandType = System.Data.CommandType.StoredProcedure;            command.Parameters.AddWithValue("@AdmissionNumber", Int32.Parse(hfv.Value));            SqlDataReader reader = command.ExecuteReader();            reader.Read();            lTitle.Text = reader.GetValue(0).ToString();            lSurname.Text = reader.GetValue(1).ToString();            lForename.Text = reader.GetValue(2).ToString();            lCalled.Text = reader.GetValue(3).ToString();            lDoB.Text = reader.GetValue(4).ToString().Substring(0,10);            lSex.Text = reader.GetValue(5).ToString();            reader.Close();        }        connection.Close();    }}
 

All the connections work, the data is retrieved, etc, so everything
except the OnClick firing works. I've done a search of the internet and the forum, and
found this seems to have been a long-standing problem since the first
ASP.NET, but there is no solution for ASP.NET 3.5. Does anyone know what
causes this, or where I might be going wrong?

(Also posted on StackOverflow, under the same subject)