Hi Sukhdepp Kaur,

     Yes, the best way to do so is by using a client side event OnBeforeWindowClosed and make the return value into false. The object expected error is occured, perhaps, you did not specify the specific object. Attached is a sample code to show a WebDialogBox after we click on "X" button and asking for confirmation of closing the window.

     I hope it helps and please do not hesitate to ask if you have any other questions. Thank you.

Best Regards,

Andi Santoso

Hi Andy,

Thanks for your reply. I tried the code you have provided. My issue is slightly different. OnBeforeClosed event i want to check if there are any unsaved changes on page, then show the prompt to ask user "if they want to save changes". If there are no unsaved changes then i dont need any prompt before close. But if i use webdialogbox like you have suggested, it will appear everytime user clicks 'X' on window. I am already checking for unsaved changes on the onbeforeunload event of page which is ContentURL of window. It works fine just shows the prompt after closing the window. I would like to send you code sample of what i am trying to achieve if you can kindly provide me with your email address.

Thanks,

Sukhdeep

Hi Sukhdepp Kaur,

     Okay, now I understand the situation. Yes, it would be a really big help and appreciation if you would kindly to send the running sample into my email. You can send them to my email at andi@intersoftpt.com. Thank you and have a nice day.

Best Regards,

Andi Santoso