RadAjaxManager.GetCurrent() returns null for Nested master pages and a content page

[Abhay Jain]

Hello,

I have a content page that in turn has 'nested' master pages. Please see the following:

MasterPage1
-- MasterPage2
   -- MasterPage3
       -- ContentPage

I have put RadAjaxManager (RadAjaxManagerOnMasterPage1) on MasterPage1 and a RadAjaxManagerProxy on ContentPage.

MasterPage1 has a label (LabelOnMasterPage1) that I need to update when user clicks a button (ButtonOnContentPage) lying on ContentPage.

Now, on ContentPage, I have the following code.

            MasterPage1 masterPage1
                = (MasterPage1)this.Master.Master.Master;

            RadAjaxManager radAjaxManagerOnMasterPage1
                = (RadAjaxManager)masterPage1.FindControl("RadAjaxManagerOnMasterPage1");

            if (radAjaxManagerOnMasterPage1 != null)
            {
                radAjaxManagerOnMasterPage1 .AjaxSettings.Clear();
                radAjaxManagerOnMasterPage1 .AjaxSettings.AddAjaxSetting(ButtonOnContentPage, masterPage1.GetLabelOnMasterPage1);
            }

NOTE: There is a property in MasterPage1 (GetLabelOnMasterPage1) that returns reference to LabelOnMasterPage1.

When I execute the above code, NullReferenceException is raised when AddAjaxSetting is called. Upon analysis, I found that RadAjaxManager.GetCurrent(ButtonOnContentPage.Page) returns NULL.

NOTE: GetCurrent() is eventually called in AddAjaxSetting (as per the disassembler code).

I tried writing this code both at Page_Load and OnPreRender but it worked nowhere.

Kindly tell me what is it that I am missing?

~Abhay

[Pavel]

Hello Abhay,

I have prepared a simple example illustrating the desired functionality. Try it out and let us know if you encounter any problems with it.

All the best,
Pavel
the Telerik team

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[Abhay Jain]

Thanks a ton Pavel. Your solution indeed helped me resolve the problem.

Your code was absolutely similar to what I had required except the order of RadScriptManager and RadAjaxManager on Master Page 1. In my case, I had placed RadAjaxManager before RadScriptManager. I don't know why this causes problem but the moment I changed the order the other way, GetCurrent() stopped returning null.

I completely adore Telerik Support :)