ceschamo

but whats is failing here is actually: this.GridView1.FindControl("btnExport"), its not finding the control and thats why I cannot register it...

Hi, I resolved the problem finding the control, the control was at the footer so by using 

(LinkButton)this.GridView1.FooterRow.FindControl("btnExport");

after that I was able to register the control and its working now,

thanks for your help