Modalpopup gets call again on page refreshing.

Question

Hello all,

 

I have modal popup extender in my asp.net page. In that modalpopup i have button control named Add. When i submit the records clicking on Add button and close the modal popup extender. And suppose i refresh the page, again that same button click event 'Add_Click' from modalpopup gets called and same records are inserted into database. In database the primary key is identity. So i want to avaoid this through code behind. Please suggest me any idea.

 

Thank you very much in advance.

 

Best Regards,

Yogesh