Button Click Event

Question

  I've been coding with vb for years and am trying to convert some of my code to C#. Have panel with 9 buttons. In vb.net have click event that alles me place letters in button then swich them. I click events and Handles(eg Handles b1.click, b2.click etc. In C# can not find a clik event that works. 

 Would appreciate if someone could point me in right direction.