Button click eka client side javascript walin form post ekak yawanne server ekata, java scripts nathuwa client side eke indan server request ekak karanna wenawidihak na (except normal url requests). Visual studio eke button ekak adala dammahama javascripts lot ekak watenawa final out put ekata. Apita button click eka onenam javascript ekakin trigger karathahaki. Javascripts nattan oya kisi ekak wadakaranne naha. Javascript walin thamai normal form post event ekata attributes add karala server side ekedi filter karanawa mona button ekenda me request eka awe kiyala. Passe thamai api button click event eke liyapu coding eka execute karala IIS eka response eka arinne. Javascript debug karala balanna wade kohomada wenne kiyala. Client events server side ekata okkoma yanne javascripts walin thamai post method eka through.