title: C# How to make a control like Pivot Table
body: <p>I want to create myself a pivot table control like in excel. I know that there is commercial library to do this, but it is too expensive with me.</p>
  <p>I don't know what is the term of this type of control (the circle in the picture), which can help me to define sum, count, average, ... for the field I want to calculate.</p>
  <p>Anyone know the term so that I can google ?</p>
  <p>Thank you so much</p>
  <p><a href="https://i.stack.imgur.com/Ucjqc.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Ucjqc.png" alt="enter image description here" /></a></p>