CustomizationPlugIn.cs

using System;
using PX.Data;
using System.Collections.Specialized;
using Customization;
using System.Web.Security;
using System.IO;
using PX.Common;

namespace ChangeWebConfig
{
 
  //Customization plugin is used to execute custom actions after customization project was published  
  public class MyPlugIn: CustomizationPlugin
  {
    //This method executed right after website files were updated, but before website was restarted
    //Method invoked on each cluster node in cluster environment
    //Method invoked only if runtimecompilation is enabled
    //Do not access custom code published to bin folder, it may not be loaded yet
    public override void OnPublished()
    {
      this.WriteLog("OnPublished Event");
      
      String file = File.ReadAllText(Path.Combine(PX.Data.Update.PXInstanceHelper.RootFolder, "packages.config"));
      file = webconfig.Replace("</packages>", 
         "<package id=/"Newtonsoft.Json/" version=/"6.0.8/" targetFramework=/"net451/" /></packages>");
      File.WriteAllText(Path.Combine(PX.Data.Update.PXInstanceHelper.RootFolder, "packages.config"), file);
    }

    //This method executed after customization was published and website was restarted.  
    public override void UpdateDatabase()
    {
      this.WriteLog("UpdateDatabase Event");
    }
  }
}