Javascript Confirm and passing value back to server side

I have the following command to delete button.

DeleteButton.Attributes.Add("Onclick", "javascript:return confirm(Are you sure?" + ");");

I want to know what the user has clicked(Ok/Cancel) on the server 开发者_运维百科side to continue with delete.

How can this be achieved? code snippet or example would be great.

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since you're relying on javascript for the confirmation, you can stop the delete action before it gets submitted to the server.

DeleteButton.Attributes.Add("Onclick", 
    "if ( ! confirm('Are you sure?') ) { return false; }" );

keep in mind that if the user has javascript disabled, all of this is going to doing absolutely nothing. you should have a backup method of verification that operates server-side.