title: C# Line Chart How to Create Vertical Line
body: <p>I have a line chart. For example like this;</p>
  
  <p><img src="https://i.stack.imgur.com/07PvX.jpg" alt="enter image description here"></p>
  
  <p>I want to draw a vertical line that have a label at the bottom of it. And i want that label move through x points of chart with its vertical line when i drag it above those x points. I will get the y points where that line with label matches Y axis</p>
  
  <p>For example;</p>
  
  <p><img src="https://i.stack.imgur.com/c05e5.jpg" alt="enter image description here"></p>
  
  <p><img src="https://i.stack.imgur.com/UypqU.jpg" alt="enter image description here"></p>
  
  <p>How can i do this?</p>