Hi,

 

the attachments list is server side state.

 

There's 2 solution for it :

 

A. call a button.click() and let it postback, call the DeleteAllAttachments() at server side.

 

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B. you can just hide the table ( Attachments1.GetItemsTable().ClientID ) , set a flag to a hidden field , and call the DeleteAllAttachments() at server side OnLoad event if the hidden field is setted.

 

Regards,

Terry