title: handle button click event inside gridview
body: <p>I am writing asp.net project in C#.</p>
  
  <p>The page consists of gridview, it is filled from database initially. The buttons, textboxes and dropdownlists are inside gridview as in the picture picture.</p>
  
  <p><img src="https://i.stack.imgur.com/TGPFz.png" alt="gridview"></p>
  
  <p>I want to handle button(сообщить) click event so that I know what row of gridview is clicked in order to get the selected value of dropdowlnist and value of textbox from that row to update the database.</p>
  
  <p>Does someone know how to do this?
  Thanks!</p>