Problem with UI Automation

 Hi,

Iam using UI automation APi for automating ASP.Net controls on Web page.

 Iam trying to identify the text box using Automation ID .The following code is intermittently working.

   aeWindow = aeDesktop.FindFirst(TreeScope.Descendants, new PropertyCondition(AutomationElement.NameProperty, WindowName));
               aeText = aeWindow.FindFirst(TreeScope.Descendants, new PropertyCondition(AutomationElement.AutomationIdProperty, TextBoxName));
           

Some times Iam getting the text box and sometimes it is returning null.

Is there any specific reason for not identifying the controls? Why it is inconsistently behaving?

Thanks,

Mohan

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mohandasgandhi