In my mind，I think it's because of the OnInit problem——it will recreate controls again and again：I mean you can try to set a property called "Flag" with viewstate to check whether it's the first load or not，and say if(Flag)｛……｝。
And anyway，I think you are using CreateChildControls method to be overriden……。So please do to set ChildControlCreated=true in order to avoid being recreated again。
Decker Dong ...
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Re: Event handler for dynamically created linkbuttons in custom webpart
Feb 26, 2012 12:05 AM|LINK
Hello：）
In my mind，I think it's because of the OnInit problem——it will recreate controls again and again：I mean you can try to set a property called "Flag" with viewstate to check whether it's the first load or not，and say if(Flag)｛……｝。
And anyway，I think you are using CreateChildControls method to be overriden……。So please do to set ChildControlCreated=true in order to avoid being recreated again。
Reguards！