1. Download ZedGraph control
Download address: https://sourceforge.net/projects/zedgraph/files/?source=navbar
Then unzip the downloaded .zip file.
2. Install ZedGraph control
Open any .sln (solution) file, right-click on the " Toolbox ", and then click " Select Item ".
Click " Browse ", find the ZedGraph.dll and ZedGraph.Web.dll files, and click Open.
Find that ZedGraphControl and ZedGraphWeb are added, and then click OK.
Finally, you can use the ZedGraphControl control in the control list.