and also make html button as server side and added serverside event on Page_Init and put some code so it's not firing also..

Thank you bro you did 90% of my work in short 100% and rest of the part found by this link...

http://www.aspforums.net/Threads/111893/Open-Show-BootStrap-Modal-Popup-from-Server-Side-in-ASPNet/