First download NUGet from NuGet.org.
Install it for your cordinating version of visual studio
Once installed Launch VS then launch NuGet’s console from within
Run the following line for Framework 4.0 and Above
PM> Install-Package ASTreeView
If your project is targeted to .Net Framework 2.0 or 3.5, please install the legacy package using this line below instead.
PM> Install-Package ASTreeView.Legacy
Once ran add the reference to the project, The path to the DLL looked like this
C:\Users[username]\Documents\Visual Studio 2015\Projects\ASPTreeDragAndDrop\packages\ASTreeView.126.96.36.199\lib\net40
Then after that add the utilities to the toolbox.
Now you can start adding your tree and design your Drag and Drop Functionality.