无法在文本框中加载值

I have textboxes which is placed inside accordian (ajax control).In pageload event i have written the code to load values in textboxes. But onload event one error is coming as object not set to instance of a object. Values are not coming in textboxes. Then i tried to initialize controls in textboxes .Then the error cleared. But Values are not coming in textboxes. What may be the reason for this?I have textboxes which is placed inside accordi