使用多个表单，在ASP.NET Web表单页面上提交按钮

I have 3 different submit buttons(Log In, Search, Insert) in the same page and what I want is to find the best way to have this 3 buttons doing a different things when I press them, or I press enter while I am about to press them. As you can see from my photo, when I press I have 3 different submit buttons(Log In, Se