UpdatePanel within a repeater giving EventValidation error

See more:

C#

ASP.NET

Hi.

I have an asp:repeater which includes an asp:dropdownlist in its template as well as an update panel. The asp:dropdownlist is outside of the update panel.

I am using the repeater.ItemDataBound event to populate the repeater items.

The only postback trigger I have for the update panel is the dropdownlist.

I have to check the e.item.FindControl("dropdownlist").UniqueID against the Request.Form["__EVENTTARGET"] to make sure I'm updating the correct update panel, and I use the value of Request.Form[e.item.FindControl("dropdownlist").UniqueID] to update the items within the updatepanel. I then have to call updatepanel.Update().

This works fine the first time, but then I get the event validation error after that.

Is there a way I can avoid turning off event validation?

do I have to wrap all of my controls in the update panel?

Thanks

PS
Here is some code (ugly because still incomplete)

//ItemDataBoundEventHandler
void RepeaterItemDataBound(object sender, RepeaterItemEventArgs e)
{
    CalenderDate calDate = e.Item.FindControl("calDate") as CalenderDate;
    Label lblNumber = e.Item.FindControl("lblNumber") as Label;

    Label lblda = e.Item.FindControl("lblda") as Label;
    Label lbldd = e.Item.FindControl("lbldd") as Label;
    Label lbldt = e.Item.FindControl("lbldt") as Label;
    Label lblaa = e.Item.FindControl("lblaa") as Label;
    Label lblad = e.Item.FindControl("lblad") as Label;
    Label lblat = e.Item.FindControl("lblat") as Label;

    DropDownList ddlp = e.Item.FindControl("ddlp") as DropDownList;

    ReadOnlyFormControl vlblForname = e.Item.FindControl("vlblForname") as ReadOnlyFormControl;
    ReadOnlyFormControl vlblSurname = e.Item.FindControl("vlblSurname") as ReadOnlyFormControl;

    UpdatePanel uppDetails = e.Item.FindControl("uppDetails") as UpdatePanel;


    Model.FInstance fInstance = e.Item.DataItem as Model.FInstance;

    if (!IsPostBack)
    {

        ddlp.Bind(GetPList(fInstance.InternalId), "InternalId", "FullName");

        calDate.Date = fInstance.sd;

        lblNumber.Text = string.Format("{0}", fInstance.Number);

        lblda.Text = string.Format("{0}", fInstance.daCode);
        lbldd.Text = string.Format("{0}", (fInstance.sd).ToString("dd/MM/yyyy"));
        lbldt.Text = string.Format("{0}", (fInstance.sd).ToString("HH:mm"));

        lblaa.Text = string.Format("{0}", fInstance.daCode);
        lblad.Text = string.Format("{0}", (fInstance.sa).ToString("dd/MM/yyyy"));
        lblat.Text = string.Format("{0}", (fInstance.sa).ToString("HH:mm"));

        if (ddlp.Items.Count > 0 && ddlp.SelectedIndex > -1)
        {
            Model.P p= GetP(ddlp.SelectedValue);

            vlblForname.Text = p.Forename;
            vlblSurname.Text = p.Surname;
            upPDetails.Update();
        }

    }
    else
    {
        var requestTarget = Request.Form["__EVENTTARGET"];

        if (requestTarget.Equals(ddlp.UniqueID))
        {
            string pId = Request.Form[ddlp.UniqueID];

            Model.P p = GetP(pId);

            vlblForname.Text = p.Forename;
            vlblSurname.Text = p.Surname;
            uppDetails.Update();
        }
    }
}

<asp:Repeater runat="server" ID="rptFRepeater">
    <ItemTemplate>
        <div class="panel panel-default">
            <div class="panel panel-body">
                <div class="panel panel-heading">
                    <h4>Ident: <asp:Label CssClass="strong" runat="server" ID="lblNumber" /></h4>
                </div>
                <div class="col-sm-1">
                    <util:Calendar  runat="server" ID="calDate"/>
                </div>
                <div class="col-sm-5">
                                        
                    <div class="row">
                        <div class="col-sm-6">
                            <div class="styled-header">
                                 D
                            </div>
                            <table>
                                <tr>
                                    <td style="text-align: right">
                                        A:
                                    </td>
                                    <td>
                                        <asp:Label runat="server" ID="lblda" />
                                    </td>
                                </tr>
                                <tr>
                                    <td style="text-align: right">
                                        Date:
                                    </td>
                                    <td>
                                        <asp:Label runat="server" ID="lbldd" />
                                    </td>
                                </tr>
                                <tr>
                                    <td style="text-align: right">
                                        Time:
                                    </td>
                                    <td>
                                        <asp:Label runat="server" ID="lbldt" />
                                    </td>
                                </tr>
                            </table>
                        </div>
                        <div class="col-sm-6">
                            <div class="styled-header">
                                 A
                            </div>
                            <table>
                                <tr>
                                    <td style="text-align: right">
                                        A:
                                    </td>
                                    <td>
                                        <asp:Label runat="server" ID="lblaa" />
                                    </td>
                                </tr>
                                <tr>
                                    <td style="text-align: right">
                                        D:
                                    </td>
                                    <td>
                                        <asp:Label runat="server" ID="lblad" />
                                    </td>
                                </tr>
                                <tr>
                                    <td style="text-align: right">
                                        T:
                                    </td>
                                    <td>
                                        <asp:Label runat="server" ID="lblat" />
                                    </td>
                                </tr>
                            </table>
                        </div>
                    </div>     
                </div>
                <div class="col-sm-6">
                    <div class="col-sm-12">
                        <div class="styled-header">
                             P
                        </div>
                    </div>
                    <div class="col-sm-6">
                        <asp:DropDownList runat="server" ID="ddlp" CssClass="list-box-full-width" AutoPostBack="true"/>
                    </div>
                    <div class="col-sm-6">
                        <asp:UpdatePanel runat="server" ID="upDetails" ChildrenAsTriggers="false" UpdateMode="Conditional">
                            <ContentTemplate>
                                <div class="form-horizontal">
                                    <vlbl:ReadOnlyFormControl  runat="server" ID="vlblForname" Label="Forename"/>
                                    <vlbl:ReadOnlyFormControl  runat="server" ID="vlblSurname" Label="Surname"/>
                                </div>
                            </ContentTemplate>
                            <Triggers>
                                <asp:AsyncPostBackTrigger ControlID="ddlp" EventName="SelectedIndexChanged"/>
                            </Triggers>
                        </asp:UpdatePanel>
                    </div>
                </div>
            </div>
        </div>
    </ItemTemplate>
</asp:Repeater>