NullReferenceException was threw out when adding AddAjaxSetting in Content Page

[TravelMan]

Hey,

I put RadAjaxManager and RadAjaxLoadingPanel in Master page and try to call AddAjaxSetting in content page. The NullReferenceException thew out.

here is code in content page

 

protected void Page_Load(object sender, EventArgs e)

 

{

Button searchButton = (Button)this.SearchCriteria.FindControl("btnSearch");

 

 

RadAjaxManager AjaxManager = (RadAjaxManager)this.Master.FindControl("RadAjaxManager1");

 

AjaxManager.AjaxSettings.AddAjaxSetting(searchButton,

this.radGrid, null);

 

 

if (!IsPostBack)

 

{

// BuildGrid();

}

}

Here is code in master page

 

 

<telerik:RadAjaxManager ID="RadAjaxManager1" runat="server" DefaultLoadingPanelID="RadAjaxLoadingPanel1">

 

 

 

 

 

</telerik:RadAjaxManager>

 

 

 

 

 

<telerik:RadAjaxLoadingPanel ID="RadAjaxLoadingPanel1" runat="server" Height="75px"

 

 

 

 

 

Width="75px">

 

 

 

 

 

<img alt="Loading..." src='<%= RadAjaxLoadingPanel.GetWebResourceUrl(Page, "Telerik.Web.UI.Skins.Default.Ajax.loading.gif") %>'

 

 

 

 

 

style="border: 0px;" />

 

 

 

 

 

</telerik:RadAjaxLoadingPanel>

 

[Iana Tsolova]

Hi Lei,

Please try using the RadAjaxManager.GetCurrent() static method to get reference to the RadAjaxManager placed in the master page and see if it makes any difference:

protected void Page_Load(object sender, EventArgs e)
{
    RadAjaxManager AjaxManager = RadAjaxManager.GetCurrent(Page);
}

Additionally, you can check the below articles for more information on how to use RadAjax in master/content page scenarios:
http://www.telerik.com/help/aspnet-ajax/ajxajaxmasterpage.html
http://www.telerik.com/help/aspnet-ajax/ajax-manager-proxy.html
http://www.telerik.com/help/aspnet-ajax/ajxmasterpageupdateeverywhere.html
http://www.telerik.com/help/aspnet-ajax/ajxloadcontrolfromanotherwebusercontrolindifferentmasterpagecontentplaceholder.html

Greetings,
Iana
the Telerik team

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