Value cannot be null. While Adding AjaxSettings

[Gotcha]

Hi,

I have an asp repeater and i wanted to ajaxify the linkbutton on itemcreated but i am getting an error message. Can you please let me know what I am doing wrong?

Error: Value cannot be null, Parameter Page

at Telerik.Web.UI.RadAjaxManager.GetCurrent(Page page)
at Telerik.Web.UI.AjaxSettingsCollection.AddAjaxSetting(Control ajaxifiedControl, Control updatedControl, RadAjaxLoadingPanel loadingPanel, UpdatePanelRenderMode renderMode, Unit updatePanelHeight)
at Telerik.Web.UI.AjaxSettingsCollection.AddAjaxSetting(Control ajaxifiedControl, Control updatedControl, RadAjaxLoadingPanel loadingPanel, UpdatePanelRenderMode renderMode)
at Telerik.Web.UI.AjaxSettingsCollection.AddAjaxSetting(Control ajaxifiedControl, Control updatedControl, RadAjaxLoadingPanel loadingPanel)
at Telerik.Web.UI.AjaxSettingsCollection.AddAjaxSetting(Control ajaxifiedControl, Control updatedControl)
at com.celero.los_2.WebApp.Controls.Popups.CollateralAssetListControl.rptAssetList_ItemCreated(Object sender, RepeaterItemEventArgs e)
at System.Web.UI.WebControls.Repeater.OnItemCreated(RepeaterItemEventArgs e)
at System.Web.UI.WebControls.Repeater.CreateItem(Int32 itemIndex, ListItemType itemType, Boolean dataBind, Object dataItem)
at System.Web.UI.WebControls.Repeater.CreateControlHierarchy(Boolean useDataSource)
at System.Web.UI.WebControls.Repeater.OnDataBinding(EventArgs e)
at System.Web.UI.WebControls.Repeater.DataBind()
at com.celero.los_2.WebApp.Controls.Popups.CollateralAssetListControl.BindAssetGrid()
at com.celero.los_2.WebApp.Controls.Popups.CollateralAssetListControl.Page_Load(Object sender, EventArgs e)
at System.Web.Util.CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e)
at System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e)
at System.Web.UI.Control.OnLoad(EventArgs e)
at com.celero.los_2.WebApp.PresentationLogic.UserControlBase.OnLoad(EventArgs e)
at System.Web.UI.Control.LoadRecursive()
at System.Web.UI.Control.AddedControl(Control control, Int32 index)
at System.Web.UI.ControlCollection.Add(Control child)
at com.celero.los_2.WebApp.Framework.ModalPopup.ModalPopupControl.LoadContentControl()
at com.celero.los_2.WebApp.Framework.ModalPopup.ModalPopupControl.OpenPopup()
at com.celero.los_2.WebApp.Pages.Collateral.btnAddCollateralAsset_Click(Object sender, EventArgs e)
at System.Web.UI.WebControls.LinkButton.OnClick(EventArgs e)
at System.Web.UI.WebControls.LinkButton.RaisePostBackEvent(String eventArgument)
at System.Web.UI.WebControls.LinkButton.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument)
at System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument)
at System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData)
at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)

Below is the HTML mark up

<asp:Repeater ID="rptAssetList" runat="server" EnableViewState="false" OnItemCommand="rptAssetList_ItemCommand" OnItemCreated="rptAssetList_ItemCreated">
    <ItemTemplate>
        <tr class="GridRow">
            <td>
                <asp:LinkButton ID="btnSelectAsset" runat="server" Text='<%# DataBinder.Eval(Container.DataItem, "ASSLIB_TYPE")%>'
                    CommandName="Select" CommandArgument='<%# DataBinder.Eval(Container.DataItem, "ASSLIB_ID")%>'>
                </asp:LinkButton>
            </td>
            <td>
                <div>
                    <%# DataBinder.Eval(Container.DataItem, "DESCRIPTION")%>
                </div>
            </td>
            <td>
                <div style="text-align: right;">
                    <%# DataBinder.Eval(Container.DataItem, "BALANCE", "{0:c}")%>
                </div>
            </td>
        </tr>
    </ItemTemplate>
    <AlternatingItemTemplate>
        <tr class="GridAlternRow">
            <td>
                <asp:LinkButton ID="btnSelectAsset" runat="server" Text='<%# DataBinder.Eval(Container.DataItem, "ASSLIB_TYPE")%>'
                    CommandName="Select" CommandArgument='<%# DataBinder.Eval(Container.DataItem, "ASSLIB_ID")%>'>
                </asp:LinkButton>
            </td>
            <td>
                <div>
                    <%# DataBinder.Eval(Container.DataItem, "DESCRIPTION")%>
                </div>
            </td>
            <td>
                <div style="text-align: right;">
                    <%# DataBinder.Eval(Container.DataItem, "BALANCE", "{0:c}")%>
                </div>
            </td>
        </tr>
    </AlternatingItemTemplate>
</asp:Repeater>

The code Behind. I'm bascially adding an ajax setting on the btnSelectAsset on 4 asp Panel below.
And the Error is "Value cannot be null"

protected void rptAssetList_ItemCreated(object sender, RepeaterItemEventArgs e)
{

    if (e.Item.ItemType == ListItemType.AlternatingItem ||
                                e.Item.ItemType == ListItemType.Item)
    {
        LinkButton btnSelectAsset = (LinkButton)e.Item.FindControl("btnSelectAsset");
        if (btnSelectAsset != null)
        {
            RadAjaxManagerProxy1.AjaxSettings.AddAjaxSetting(btnSelectAsset, pnlShortTerm);
            RadAjaxManagerProxy1.AjaxSettings.AddAjaxSetting(btnSelectAsset, pnlPropertyFields);
            RadAjaxManagerProxy1.AjaxSettings.AddAjaxSetting(btnSelectAsset, pnlPpsa);
            RadAjaxManagerProxy1.AjaxSettings.AddAjaxSetting(btnSelectAsset, pnlVehicle);
        }
    }
}

[Mira]

Hello Gotcha,

If you need to add AJAX settings programmatically in a usercontrol / content page, it is recommended to get the master manager instance and call its methods/properties as well. You can review the RadAjaxManagerProxy topic for additional information.

I hope this helps.

Greetings,
Mira
the Telerik team

[Gotcha]

Sorry I'm confused by your answer...
Are you saying that I should not be using the following:
RadAjaxManagerProxy1.AjaxSettings.AddAjaxSetting(btnSelectAsset, pnlShortTerm);


but instead  use the RadAjaxManager from the Master Template ...soemthing like:

RadAjaxManager1.AjaxSettings.AddAjaxSetting(btnSelectAsset, pnlShortTerm);

where RadAjaxManager1 is the instance i n my Master Template?

Thanks

[Mira]

Hello Gotcha,

Please try using the following code for adding the AJAX setting and let me know whether it helps:

RadAjaxManager.GetCurrent(Page).AjaxSettings.AddAjaxSetting(btnSelectAsset, pnlShortTerm);

I am looking forward to your reply.

All the best,
Mira
the Telerik team

[James]

For our situation, the fix was to put the RadAjaxManager.AjaxSettings.AddAjaxSetting after adding the panel to the Controls (Controls.Add(panel)).