click button

i never use breakpoint in VS

at first i set breakpoint ,click in the margin indicator bar to the left of search button event and click F5 and run website it runs website like last time (whitout breack point) and in break point window didnt show any thing 

when i write my word in TB and press Enter after that click to search button it shows result at first time

but if i dont press enter i should click search button tewice.